Exhibit 3.1
                                                                     -----------

                            CERTIFICATE OF AMENDMENT
                                       OF
                           CERTIFICATE OF DESIGNATION
                                       OF
                  SERIES B JUNIOR PARTICIPATING PREFERRED STOCK

                                       OF

                           THERMO ELECTRON CORPORATION


                                  -------------


THERMO  ELECTRON  CORPORATION,  a corporation  organized and existing  under the
General Corporation Law of the State of Delaware (the "Corporation"),

DOES HEREBY CERTIFY:

     WHEREAS, at a meeting duly called and held on January 19, 1996, pursuant to
the  authority  granted  to and  vested  in  the  Board  of  Directors  of  this
Corporation  (hereinafter  called the "Board of  Directors"  or the  "Board") in
accordance with the provisions of the Certificate of Incorporation, the Board of
Directors  created a series of Preferred  Stock,  $100 par value (the "Preferred
Stock"), of the Corporation and stated the designation and number of shares, and
fixed the relative rights, preferences and limitations thereof as set forth in a
certificate of designation of Series B Junior Participating Preferred Stock (the
"Series B Preferred  Stock")  filed with the  Secretary of State of the State of
Delaware on January 24, 1996 (the "Certificate of Designation");

     WHEREAS, no shares of Series B Preferred Stock have, as of the date of this
Certificate, been issued;

     WHEREAS, pursuant to authority conferred upon the Board of Directors by the
Amended  and  Restated   Certificate  of  Incorporation,   as  amended,  of  the
Corporation,  and  pursuant  to the  provisions  of Section  151 of the  General
Corporate  Laws of the State of Delaware (the "DGCL"),  said Board of Directors,
at a meeting duly held on September 15, 2005, adopted a resolution providing for
the  amendment  and  restatement  of  the  Certificate  of  Designation,   which
resolution is as follows:

     RESOLVED:  That the Authorized Officers of the Company be, and each of them
hereby is,  authorized  in the name and on behalf of the  Company to execute and
file with the  Secretary  of State of the State of  Delaware  a  Certificate  of
Amendment of Certificate  of Designation  pursuant to Section 151(g) of the DGCL
setting forth amended and restated  resolutions,  which  resolutions  are hereby
adopted,  and any other  documents  that any of such  officers  deem  necessary,
desirable or  appropriate,  such that the  designation of the Series B Preferred
Stock and amount thereof, and the voting powers, preferences and relative




participating,  optional and other special  rights of the shares of such series,
and the  qualifications,  limitations or restrictions  thereof,  shall be as set
forth in the Terms of Series B Junior Participating  Preferred Stock attached as
Exhibit A to the Shareholder Rights Agreement.

Said Exhibit A reads as follows:

          Section 1.  Designation and Amount. The shares of such series shall be
     designated as "Series B Junior Participating  Preferred Stock" (the "Series
     B  Preferred  Stock")  and the number of shares  constituting  the Series B
     Preferred Stock shall be Forty Thousand (40,000). Such number of shares may
     be increased or  decreased  by  resolution  of the Board prior to issuance;
     provided,  that no decrease  shall  reduce the number of shares of Series B
     Preferred Stock to a number less than the number of shares then outstanding
     plus the  number of shares  reserved  for  issuance  upon the  exercise  of
     outstanding  options,  rights or  warrants  or upon the  conversion  of any
     outstanding securities issued by the Corporation  convertible into Series B
     Preferred Stock.

          Section 2.  Dividends and Distributions.

               (A)   Subject  to the rights of the  holders of any shares of any
          series of Preferred  Stock (or any similar  stock)  ranking  prior and
          superior to the Series B Preferred  Stock with  respect to  dividends,
          the holders of shares of Series B Preferred  Stock,  in  preference to
          the holders of Common  Stock,  par value $1.00 per share (the  "Common
          Stock"),  of the Corporation,  and of any other junior stock, shall be
          entitled  to  receive,  when,  as and if  declared by the Board out of
          funds  of  the  Corporation  legally  available  for  the  payment  of
          dividends,  quarterly  dividends payable in cash on March 31, June 30,
          September  30 and  December  31 in each year  (each  such  date  being
          referred to herein as a "Quarterly Dividend Payment Date"), commencing
          on the first Quarterly  Dividend Payment Date after the first issuance
          of a share or fraction of a share of Series B Preferred  Stock,  in an
          amount per share (rounded to the nearest cent) equal to the greater of
          (a) $100 or (b) subject to the  provision for  adjustment  hereinafter
          set forth,  100,000  times the  aggregate per share amount of all cash
          dividends,  and 100,000 times the aggregate per share amount  (payable
          in kind) of all non-cash dividends or other distributions,  other than
          a dividend  payable in shares of Common Stock or a subdivision  of the
          outstanding shares of Common Stock (by reclassification or otherwise),
          declared on the Common Stock since the immediately preceding Quarterly
          Dividend Payment Date or, with respect to the first Quarterly Dividend
          Payment Date,  since the first  issuance of any share or fraction of a
          share of Series B Preferred Stock. In the event the Corporation  shall
          at any time declare or pay any dividend on the Common Stock payable in
          shares  of  Common  Stock,  or effect a  subdivision,  combination  or
          consolidation   of  the   outstanding   shares  of  Common  Stock  (by
          reclassification  or otherwise than by payment of a dividend in shares
          of Common  Stock) into a greater or lesser  number of shares of Common
          Stock, then in each such case the amount to which holders of shares of
          Series B Preferred Stock were entitled immediately prior to such event
          under  clause  (b) of the  preceding  sentence  shall be  adjusted  by
          multiplying  such amount by a fraction,  the numerator of which is the
          number of shares of Common Stock outstanding immediately after such

                                       2



          event and the  denominator  of which is the number of shares of Common
          Stock that were  outstanding  immediately  prior to such event. In the
          event the Corporation shall at any time declare or pay any dividend on
          the Series B Preferred  Stock  payable in shares of Series B Preferred
          Stock, or effect a subdivision,  combination or  consolidation  of the
          outstanding shares of Series B Preferred Stock (by reclassification or
          otherwise  than by  payment  of a  dividend  in  shares  of  Series  B
          Preferred Stock) into a greater or lesser number of shares of Series B
          Preferred Stock, then in each such case the amount to which holders of
          shares of Series B Preferred Stock were entitled  immediately prior to
          such event under clause (b) of the first sentence of this Section 2(A)
          shall be  adjusted  by  multiplying  such  amount by a  fraction,  the
          numerator of which is the number of shares of Series B Preferred Stock
          that  were  outstanding  immediately  prior  to  such  event  and  the
          denominator  of which is the  number of  shares of Series B  Preferred
          Stock outstanding immediately after such event.

               (B)   The Corporation shall declare a dividend or distribution on
          the Series B  Preferred  Stock as provided  in  paragraph  (A) of this
          Section  immediately  after it declares a dividend or  distribution on
          the Common  Stock  (other than a dividend  payable in shares of Common
          Stock) and the Corporation  shall pay such dividend or distribution on
          the Series B  Preferred  Stock  before the  dividend  or  distribution
          declared on the Common Stock is paid or set apart;  provided  that, in
          the event no dividend or distribution  shall have been declared on the
          Common Stock during the period between any Quarterly  Dividend Payment
          Date  and the next  subsequent  Quarterly  Dividend  Payment  Date,  a
          dividend  of $100 per  share on the  Series B  Preferred  Stock  shall
          nevertheless be payable on such subsequent  Quarterly Dividend Payment
          Date.

               (C)   Dividends shall  begin  to  accrue  and  be  cumulative  on
          outstanding  shares of Series B  Preferred  Stock  from the  Quarterly
          Dividend Payment Date next preceding the date of issue of such shares,
          unless the date of issue of such  shares is prior to the  record  date
          for the first Quarterly Dividend Payment Date, in which case dividends
          on such  shares  shall  begin to accrue from the date of issue of such
          shares,  or unless the date of issue is a Quarterly  Dividend  Payment
          Date or is a date  after  the  record  date for the  determination  of
          holders of shares of Series B  Preferred  Stock  entitled to receive a
          quarterly dividend and before such Quarterly Dividend Payment Date, in
          either of which  events  such  dividends  shall begin to accrue and be
          cumulative  from such  Quarterly  Dividend  Payment Date.  Accrued but
          unpaid dividends shall not bear interest. Dividends paid on the shares
          of Series B Preferred Stock in an amount less than the total amount of
          such dividends at the time accrued and payable on such shares shall be
          allocated pro rata on a share-by-share  basis among all such shares at
          the time outstanding. The Board of Directors may fix a record date for
          the  determination  of holders of shares of Series B  Preferred  Stock
          entitled  to receive  payment of a dividend or  distribution  declared
          thereon, which record date shall be not more than 60 days prior to the
          date fixed for the payment thereof.

          Section 3.  Voting Rights. The holders of shares of Series B Preferred
     Stock shall have the following voting rights:

                                       3



               (A)   Subject to the provision  for  adjustment  hereinafter  set
          forth, each share of Series B Preferred Stock shall entitle the holder
          thereof to 100,000  votes on all  matters  submitted  to a vote of the
          stockholders of the Corporation. In the event the Corporation shall at
          any time declare or pay any  dividend on the Common  Stock  payable in
          shares  of  Common  Stock,  or effect a  subdivision,  combination  or
          consolidation   of  the   outstanding   shares  of  Common  Stock  (by
          reclassification  or otherwise than by payment of a dividend in shares
          of Common  Stock) into a greater or lesser  number of shares of Common
          Stock,  then in each such case the  number of votes per share to which
          holders  of  shares  of  Series  B  Preferred   Stock  were   entitled
          immediately  prior to such event shall be adjusted by multiplying such
          number by a fraction,  the  numerator of which is the number of shares
          of Common  Stock  outstanding  immediately  after  such  event and the
          denominator of which is the number of shares of Common Stock that were
          outstanding  immediately  prior  to  such  event.  In  the  event  the
          Corporation  shall  at any time  declare  or pay any  dividend  on the
          Series B  Preferred  Stock  payable  in shares  of Series B  Preferred
          Stock, or effect a subdivision,  combination or  consolidation  of the
          outstanding shares of Series B Preferred Stock (by reclassification or
          otherwise  than by  payment  of a  dividend  in  shares  of  Series  B
          Preferred Stock) into a greater or lesser number of shares of Series B
          Preferred Stock,  then in each such case the number of votes per share
          to which  holders of shares of Series B Preferred  Stock were entitled
          immediately  prior to such event shall be adjusted by multiplying such
          amount by a fraction,  the  numerator of which is the number of shares
          of Series B Preferred Stock that were outstanding immediately prior to
          such  event and the  denominator  of which is the  number of shares of
          Series B Preferred Stock outstanding immediately after such event.

               (B)   Except as otherwise provided herein, the holders of shares
          of Series B Preferred Stock and the holders of shares of Common Stock
          and any other capital stock of the Corporation  having general voting
          rights shall vote together as one class on all matters submitted to a
          vote of stockholders of the Corporation.

               (C)   (i)   If at any time dividends on any Series B Preferred
          Stock shall be in arrears in an amount equal to six quarterly
          dividends thereon, the holders of the Series B Preferred  Stock,
          voting as a separate series from all other series of Preferred Stock
          and classes of capital stock, shall be entitled to elect two members
          of the Board in addition to any Directors elected by any other series,
          class or classes of securities and the authorized number of Directors
          will automatically be increased by two. Promptly  thereafter, the
          Board of Directors of this Corporation  shall, as soon as may be
          practicable, call a special  meeting of holders of Series B Preferred
          Stock for the purpose of electing such members of the Board of
          Directors.  Said special meeting shall in any event be held within 45
          days of the occurrence of such arrearage.

                                       4



                    (ii)   During  any  period when  the  holders  of  Series  B
               Preferred Stock,  voting as a separate series,  shall be entitled
               and shall  have  exercised  their  right to elect two  Directors,
               then, and during such time as such right continues,  (a) the then
               authorized number of Directors shall be increased by two, and the
               holders of Series B Preferred Stock, voting as a separate series,
               shall be entitled to elect the  additional  Directors so provided
               for, and (b) each such additional  Director shall not be a member
               of any existing class of the Board of Directors,  but shall serve
               until the next annual meeting of stockholders for the election of
               Directors,  or until his or her  successor  shall be elected  and
               shall  qualify,  or until his or her  right to hold  such  office
               terminates pursuant to the provisions of this Section 3(C).

                     (iii) A Director elected pursuant to the terms hereof may
               be removed  with or without cause by the  holders  of  Series  B
               Preferred Stock entitled to vote in an election of such Director.

                     (iv)  If, during any interval between annual  meetings of
               stockholders  for the election of Directors and while the holders
               of  Series B  Preferred  Stock  shall be  entitled  to elect  two
               Directors,  there is no such  Director  in  office  by  reason of
               resignation,  death or removal,  then, promptly  thereafter,  the
               Board  shall call a special  meeting  of the  holders of Series B
               Preferred  Stock for the purpose of filling such vacancy and such
               vacancy  shall be filled at such  special  meeting.  Such special
               meeting  shall  in any  event  be  held  within  45  days  of the
               occurrence of such vacancy.

                     (v)   At such time as the arrearage is fully cured, and all
               dividends  accumulated  and  unpaid  on any  shares  of  Series B
               Preferred Stock  outstanding are paid, and, in addition  thereto,
               at least one regular  dividend has been paid subsequent to curing
               such  arrearage,  the  term of  office  of any  Director  elected
               pursuant to this Section  3(C),  or his or her  successor,  shall
               automatically  terminate,  and the authorized number of Directors
               shall automatically decrease by two, the rights of the holders of
               the shares of the Series B Preferred Stock to vote as provided in
               this Section  3(C) shall  cease,  subject to renewal from time to
               time  upon the same  terms and  conditions,  and the  holders  of
               shares  of the  Series B  Preferred  Stock  shall  have  only the
               limited voting rights elsewhere herein set forth.

               (D)   Except as set forth herein, or as otherwise provided by
          law, holders of Series B Preferred Stock shall have no special  voting
          rights and their consent  shall not be required  (except to the extent
          they are  entitled to vote with  holders of Common  Stock as set forth
          herein) for taking any corporate action.

                                       5



          Section 4.  Certain Restrictions.

               (A)   Whenever   quarterly  dividends   or  other   dividends  or
          distributions  payable on the Series B Preferred  Stock as provided in
          Section 2 are in arrears,  thereafter and until all accrued and unpaid
          dividends and  distributions,  whether or not  declared,  on shares of
          Series B Preferred Stock outstanding shall have been paid in full, the
          Corporation shall not:

                     (i)   declare   or  pay   dividends,  or  make  any other
               distributions,  on any shares of stock ranking  junior (either as
               to dividends or upon  liquidation,  dissolution or winding up) to
               the Series B Preferred Stock;

                     (ii)  declare   or  pay   dividends,   or  make  any  other
               distributions, on any shares of stock ranking on a parity (either
               as to dividends or upon  liquidation,  dissolution or winding up)
               with the Series B Preferred Stock,  except dividends paid ratably
               on the  Series B  Preferred  Stock and all such  parity  stock on
               which  dividends  are payable or in arrears in  proportion to the
               total  amounts to which the  holders of all such  shares are then
               entitled;

                     (iii) redeem  or   purchase  or   otherwise   acquire  for
               consideration  shares of any stock ranking  junior  (either as to
               dividends or upon liquidation,  dissolution or winding up) to the
               Series B Preferred  Stock,  provided that the  Corporation may at
               any time redeem, purchase or otherwise acquire shares of any such
               junior  stock  in  exchange  for  shares  of  any  stock  of  the
               Corporation  ranking  junior  (either  as to  dividends  or  upon
               dissolution, liquidation or winding up) to the Series B Preferred
               Stock; or

                     (iv)  redeem  or  purchase   or   otherwise   acquire  for
               consideration  any  shares of Series B  Preferred  Stock,  or any
               shares of stock  ranking on a parity  with the Series B Preferred
               Stock, except in accordance with a purchase offer made in writing
               or by publication  (as determined by the Board) to all holders of
               such shares upon such terms as the Board, after  consideration of
               the respective  annual  dividend rates and other relative  rights
               and  preferences  of the  respective  series and  classes,  shall
               determine  in  good  faith  will  result  in fair  and  equitable
               treatment among the respective series or classes.

               (B)   The Corporation shall  not  permit  any  subsidiary  of the
          Corporation  to purchase or otherwise  acquire for  consideration  any
          shares of stock of the Corporation unless the Corporation could, under
          paragraph  (A) of this Section 4,  purchase or otherwise  acquire such
          shares at such time and in such manner.

          Section 5.  Reacquired  Shares. Any shares of Series B Preferred Stock
     purchased or otherwise acquired by the Corporation in any manner whatsoever
     shall be retired and cancelled promptly after the acquisition  thereof. All
     such shares shall upon their  cancellation  become  authorized but unissued
     shares of  Preferred  Stock and may be  reissued as part of a new series of
     Preferred Stock subject to the conditions and  restrictions on issuance set

                                       6



     forth herein or in any other  Certificate of Designation  creating a series
     of Preferred Stock or any similar stock or as otherwise required by law.

          Section 6.  Liquidation, Dissolution or Winding Up.

               (A)   Upon  any  liquidation, dissolution or winding  up of the
          Corporation,  no  distribution  shall  be made (1) to the  holders  of
          shares  of  stock  ranking  junior  (either  as to  dividends  or upon
          liquidation,  dissolution  or winding  up) to the  Series B  Preferred
          Stock  unless,  prior  thereto,  the  holders  of  shares  of Series B
          Preferred  Stock shall have  received  $100 per share,  plus an amount
          equal to  accrued  and unpaid  dividends  and  distributions  thereon,
          whether or not declared,  to the date of such  payment,  provided that
          the holders of shares of Series B Preferred Stock shall be entitled to
          receive an aggregate  amount per share,  subject to the  provision for
          adjustment hereinafter set forth, equal to 100,000 times the aggregate
          amount  to be  distributed  per share to  holders  of shares of Common
          Stock,  or (2) to the  holders of shares of stock  ranking on a parity
          (either as to dividends or upon  liquidation,  dissolution  or winding
          up) with the  Series B  Preferred  Stock,  except  distributions  made
          ratably on the Series B Preferred  Stock and all such parity  stock in
          proportion  to the  total  amounts  to which the  holders  of all such
          shares are entitled upon such liquidation, dissolution or winding up.

               (B)  Neither  the   consolidation,   merger  or  other   business
          combination of the Corporation with or into any other  corporation nor
          the sale,  lease,  exchange  or  conveyance  of all or any part of the
          property,  assets or business of the Corporation shall be deemed to be
          a  liquidation,  dissolution  or  winding  up of the  Corporation  for
          purposes of this Section 6.

               (C)   In the event the Corporation shall at any time declare or
          pay any dividend on the Common Stock payable in shares of Common
          Stock, or effect a subdivision, combination or consolidation of the
          outstanding shares of Common Stock (by  reclassification or otherwise
          than by payment of a dividend in shares of Common  Stock) into a
          greater or lesser number of shares of Common Stock, then in each such
          case the aggregate amount to which holders of shares of Series B
          Preferred Stock were entitled immediately prior to such event under
          the proviso in clause (1) of paragraph  (A) of this Section 6 shall be
          adjusted by multiplying such amount by a fraction, the numerator of
          which is the number of shares of Common Stock outstanding immediately
          after such event and the denominator of which is the number of shares
          of Common Stock that were outstanding immediately prior to such event.
          In the event the Corporation shall at any time declare or pay any
          dividend on the Series B Preferred Stock payable in shares of Series B
          Preferred Stock, or effect a subdivision, combination or consolidation
          of the outstanding shares of Series B Preferred Stock (by
          reclassification or otherwise than by payment of a dividend in shares
          of Series B Preferred Stock) into a greater or lesser number of shares
          of Series B Preferred Stock, then in each such case the aggregate
          amount to which holders of shares of Series B Preferred Stock were
          entitled immediately prior to such event under the proviso in clause
          (1)of paragraph (A) of this Section 6 shall be adjusted by multiplying
          such amount by a fraction, the numerator of which is the number of
          shares of Series B Preferred Stock that were outstanding immediately

                                       7



          prior to such  event  and the denominator  of which is the  number  of
          shares of Series B Preferred Stock outstanding  immediately after such
          event.

          Section 7.  Consolidation, Merger, etc. Notwithstanding anything to
     the contrary contained herein, in case the Corporation shall enter into any
     consolidation, merger, combination or other transaction in which the shares
     of  Common  Stock  are  exchanged  for  or  changed  into  other  stock  or
     securities,  cash  and/or  any other  property,  then in any such case each
     share of  Series B  Preferred  Stock  shall at the same  time be  similarly
     exchanged or changed into an amount per share, subject to the provision for
     adjustment  hereinafter  set forth,  equal to 100,000  times the  aggregate
     amount of stock,  securities,  cash and/or any other  property  (payable in
     kind),  as the case may be,  into  which or for which  each share of Common
     Stock is changed or exchanged.  In the event the  Corporation  shall at any
     time declare or pay any  dividend on the Common Stock  payable in shares of
     Common Stock, or effect a subdivision,  combination or consolidation of the
     outstanding shares of Common Stock (by  reclassification  or otherwise than
     by  payment  of a  dividend  in shares of Common  Stock)  into a greater or
     lesser number of shares of Common Stock,  then in each such case the amount
     set forth in the preceding  sentence with respect to the exchange or change
     of shares of Series B Preferred Stock shall be adjusted by multiplying such
     amount by a  fraction,  the  numerator  of which is the number of shares of
     Common Stock  outstanding  immediately after such event and the denominator
     of which is the  number of shares of  Common  Stock  that were  outstanding
     immediately  prior to such event. In the event the Corporation shall at any
     time declare or pay any dividend on the Series B Preferred Stock payable in
     shares of Series B Preferred Stock, or effect a subdivision, combination or
     consolidation  of the  outstanding  shares of Series B Preferred  Stock (by
     reclassification  or  otherwise  than by payment of a dividend in shares of
     Series B  Preferred  Stock)  into a greater  or lesser  number of shares of
     Series B  Preferred  Stock,  then in each such case the amount set forth in
     the first sentence of this Section 7 with respect to the exchange or change
     of shares of Series B Preferred Stock shall be adjusted by multiplying such
     amount by a  fraction,  the  numerator  of which is the number of shares of
     Series B Preferred Stock that were  outstanding  immediately  prior to such
     event  and the  denominator  of which is the  number  of shares of Series B
     Preferred Stock outstanding immediately after such event.

          Section 8.  No Redemption. The shares of Series B Preferred Stock
     shall not be redeemable.

          Section 9.  Rank. The Series B Preferred Stock shall rank, with
     respect to the payment of dividends and the distribution of assets, junior
     to all series of any other class of the Preferred Stock issued either
     before or after the issuance of the Series B Preferred Stock, unless the
     terms of any such series shall provide otherwise.

          Section 10. Amendment.  The Certificate of Incorporation,  as amended,
     of the Corporation shall not be amended in any manner that would materially
     alter or change the powers,  preferences  or special rights of the Series B
     Preferred Stock so as to affect them adversely without the affirmative vote
     of the holders of at least two-thirds of the outstanding shares of Series B
     Preferred Stock, voting together as a single class.

                                       8



          Section 11. Fractional Shares. Series B Preferred Stock may be issued
     in fractions of a share that shall  entitle the holder,  in  proportion  to
     such  holder's  fractional  shares,  to  exercise  voting  rights,  receive
     dividends,  participate in distributions  and have the benefit of all other
     rights of holders of Series B Preferred Stock.

                                       9



     IN WITNESS  WHEREOF,  said  Corporation  has caused this  Certificate to be
signed by Seth H. Hoogasian, its Vice President,  General Counsel and Secretary,
this 16th day of September, 2005.


                                   /s/ Seth H. Hoogasian
                                   ---------------------------------------------
                                   Seth H. Hoogasian
                                   Vice President, General Counsel and Secretary

                                       10



                                    CORRECTED
             THIRD AMENDED AND RESTATED CERTIFICATE OF INCORPORATION
                                       OF
                           THERMO ELECTRON CORPORATION

     THERMO ELECTRON CORPORATION, a corporation organized and Existing under and
by virtue of the General Corporation Law of the State of Delaware,

     DOES HEREBY CERTIFY:

     1.   The name of the corporation is THERMO ELECTRON CORPORATION.

     2.   That a Third Amended and Restated  Certificate  of  Incorporation  was
          filed by the Secretary of State of Delaware on May 28, 1999,  and that
          said  Certificate  requires  correction as permitted by Section 103 of
          the General Corporation Law of the State of Delaware.

     3.   The  inaccuracy  or defect of said  Certificate  to be corrected is as
          follows:  In various articles throughout the document a reference to a
          Second Amended and Restated Certificate of Incorporation is mentioned.

     4.   The Third Amended and Restated  Certificate of Incorporation is hereby
          corrected and set forth in its entirety as follows:




                           THIRD AMENDED AND RESTATED
                          CERTIFICATE OF INCORPORATION

                                       OF

                           THERMO ELECTRON CORPORATION


     THERMO ELECTRON CORPORATION, a corporation organized and existing under the
laws of the State of Delaware, hereby certifies as follows:

     1.   The name of the Corporation is Thermo Electron Corporation, and the
name under which the  Corporation was originally incorporated is Thermo Electron
Engineering  Corporation.  The date of filing  of its  original  Certificate  of
Incorporation  with the  Secretary  of State was  October 11,  1960.  A Restated
Certificate of  Incorporation  was filed with the Secretary of State on February
5, 1981. An Amended and Restated  Certificate of Incorporation (the "Amended and
Restated Certificate of Incorporation") was filed with the Secretary of State on
June 21, 1994.

     2.   That  Article  THIRD  of  the  Amended  and  Restated   Certificate of
Incorporation  is amended by deleting said Article in its entirety and inserting
in lieu thereof the following text:

          "THIRD:  The nature of the  business or purposes  to be  conducted  or
     promoted by the Corporation is as follows:

          To engage in any lawful act or activity for which  corporations may be
     organized  under the General  Corporation Law of Delaware,"

     3.   That Article  FOURTH  of  the  Amended  and  Restated  Certificate  of
Incorporation is amended by:

               (a)  in the first paragraph, inserting the word "and" immediately
                    after the  text:  "one  vote for each  share so  held," and
                    immediately before the text: "(b)";

               (b)  in the first  paragraph,  deleting the text:  "Ten  Thousand
                    (10,000)"  and  inserting  in lieu  thereof  the text "Fifty
                    Thousand (50,000)";

               (c)  in the first  paragraph,  deleting the text: "; and (c)" and
                    inserting  in  lieu  thereof  the  text:  ".  Pursuant  to a
                    Certificate of Designation filed on January 31, 1996";

               (d)  in the first paragraph, inserting the text; "Preferred Stock
                    has been designated as" immediately  after the text:  "Forty
                    Thousand shares of" and immediately before the text: "Series
                    B Junior Participating Preferred Stock";

                                       1



               (e)  inserting in the second line of paragraph  (A) of Section 4,
                    the word "above" after the text "Section 2"; and

               (f)  deleting in the eighteenth  line of paragraph (C) of Section
                    6, the  reference to "this  Section 4" and inserting in lieu
                    thereof the reference to "this Section 6".

     4.   That Articles FIFTH, SIXTH, SEVENTH, EIGHTH, TENTH, and ELEVENTH of
the Amended and Restated Certificate of Incorporation are amended by deleting
said Articles in their entirety.

     5.   That  Article  NINTH  of  the  Amended  and  Restated  Certificate  of
Incorporation is amended by:

               (a) deleting the first and last sentences of paragraph (1);

               (b) deleting paragraph (2) in its entirety and inserting in lieu
                   thereof the following text:

                   "(2) In  furtherance  of and  not in  limitation  of  powers
               conferred by statute,  it is further  provided  that the Board of
               Directors is expressly  authorized to adopt,  amend or repeal the
               By-Laws of the Corporation.";

               (c)  deleting paragraphs (3), (4), (5), (6), (8) and (9) in their
                    entirety;

               (d)  inserting  in  paragraph  (7) the words "or her"  after each
                    appearance  of the word "his" in said  paragraph,  inserting
                    the words "or she" after each appearance of the word "he" in
                    said paragraph,  and inserting the words "or her" after each
                    appearance of the word "him" in said paragraph; and

               (e)  renumbering paragraph (7) as paragraph (3).

     6.   That Article NINTH is renumbered as Article FIFTH and Article TWELFTH
is renumbered as Article SIXTH.

     7.   That Article THIRTEENTH is amended by deleting such Article in its
entirety and inserting in lieu thereof the following text:

               "SEVENTH: Except to the extent that the General  Corporation Law
          of Delaware  prohibits the  elimination  or limitation of liability of
          directors  for  breaches  of  fiduciary   duty,  no  director  of  the
          Corporation  shall be  personally  liable  to the  Corporation  or its
          stockholders for monetary damages for any breach of fiduciary duty as

                                       2



          a  director   notwithstanding  any  provision  of  law  imposing  such
          liability. No amendment to or repeal of this Article shall apply to or
          have any effect on the liability or alleged  liability of any director
          of the  Corporation  for or with  respect to any acts or  omissions of
          such director occurring prior to such amendment or repeal."

     8.   That the Board of Directors of the Corporation at a meeting held on
March 18, 1999, duly adopted the following resolutions:

RESOLVED:      That it is hereby  declared  advisable and in the best  interests
               of the Corporation  that the  Corporation's  Amended and Restated
               Certificate of  Incorporation  be further amended and restated in
               the  form  distributed  at this  meeting  and  attached  to these
               resolutions  as  Exhibit A and that the  proper  officers  of the
               Corporation be, and each of them hereby is, authorized, empowered
               and  directed to execute on behalf of the  Corporation  the Third
               Amended and Restated Certificate of Incorporation to reflect such
               amendment  and  restatement,  and to file,  or cause to be filed,
               such Third Amended and Restated Certificate of Incorporation with
               the Secretary of State of the State of Delaware.

 FURTHER
 RESOLVED:     That the proposed amendment and restatement of the Corporation's
               Amended and Restated  Certificate of  Incorporation be considered
               by the  Stockholders  of the Corporation at the Annual Meeting of
               Stockholders  to be held on May 27,  1999 and that the  notice of
               such meeting shall include as an  attachment  the proposed  Third
               Amended  and  Restated   Certificate  of   Incorporation  in  its
               entirety.

     9.   That, on May 27, 1999, at the Corporation's  Annual Meeting of
Stockholders,  the amendment and  restatement of the  Corporation's  Amended and
Restated  Certificate of Incorporation  was duly adopted by the affirmative vote
of Stockholders of the Corporation holding in excess of 66-2/3% of the shares of
Common Stock,  $1.00 par value per share,  of the Corporation in accordance with
the  provisions  of Sections 222 and 242 of the General  Corporation  Law of the
State of Delaware and Article ELEVENTH of the Corporation's Amended and Restated
Certificate of Incorporation.

     10.  Except as set forth above, this Third Amended and Restated
Certificate of  Incorporation  only restates and integrates and does not further
amend the provisions of the Amended and Restated Certificate of Incorporation of
this  Corporation  as  heretofore  amended  or  supplemented  and  there  is  no
discrepancy  between those  provisions  and the provisions of this Third Amended
and  Restated  Certificate  of  Incorporation.  This Third  Amended and Restated
Certificate of  Incorporation  was duly adopted pursuant to Sections 242 and 245
of the General Corporation Law of the State of Delaware.

     11.  The text of the Amended and Restated Certificate of Incorporation as
amended or  supplemented  heretofore is hereby  further  amended and restated to
read as herein set forth in full:

                                       3



                           "THIRD AMENDED AND RESTATED

                          CERTIFICATE OF INCORPORATION

                                       OF

                           THERMO ELECTRON CORPORATION


     FIRST:    The name of the Corporation is

                           THERMO ELECTRON CORPORATION

     SECOND:   The registered office of the Corporation in the State of Delaware
is to be located in the City of Wilmington,  in the County of New Castle, in the
State of Delaware.  The name of its registered  agent is The  Corporation  Trust
Company whose address is No. 1209 Orange Street, in said city.

     THIRD:    The nature of the business or purposes to be conducted or
promoted by the Corporation is as follows:

     To engage in any  lawful  act or  activity  for which  corporations  may be
organized under the General Corporation Law of Delaware.

     FOURTH:  The total  number of shares of stock which the  Corporation  shall
have authority to issue is: (a) Three Hundred Fifty Million (350,000,000) shares
of Common Stock of the par value of $1.00 per share,  the holders of which shall
have one vote for each share so held; and (b) Fifty Thousand  (50,000) shares of
Preferred  Stock of the par  value  of $100  per  share,  to be  issued  in such
classes,  including  one or more series  within such class,  and to possess such
specific terms  including  dividend  rates,  conversion  prices,  voting rights,
redemption  prices,  maturity  dates  and  other  special  rights,  preferences,
qualifications, limitations, and restrictions thereof, as shall be determined in
the  resolution or resolutions  providing for the issue of such Preferred  Stock
adopted by the Board of Directors  from time to time.  Pursuant to a Certificate
of  Designation  filed on January 31, 1996,  Forty Thousand  (40,000)  shares of
Preferred Stock has been designated as Series B Junior  Participating  Preferred
Stock of the par value of $100 per share, the relative  rights,  preferences and
limitations of which are as follows:

     Section 1.     Designation  and  Amount. The shares of such series shall be
     designated as "Series B Junior Participating  Preferred Stock" (the "Series
     B  Preferred  Stock")  and the number of shares  constituting  the Series B
     Preferred Stock shall be 40,000.  Such number of shares may be increased or
     decreased  by  resolution  of the  Board of  Directors;  provided,  that no
     decrease shall reduce the number of shares of Series B Preferred Stock to a
     number less than the number of shares then  outstanding  plus the number of
     shares  reserved for issuance  upon the  exercise of  outstanding  options,
     rights or warrants or upon the  conversion  of any  outstanding  securities
     issued by the Corporation convertible into Series B Preferred Stock.

                                       4



     Section 2.     Dividends and Distributions.

            (A)     Subject to the rights of the holders of any shares of any
     series of Preferred Stock (or any similar stock) ranking prior and superior
     to the Series B Preferred  Stock with respect to dividends,  the holders of
     shares of Series B Preferred  Stock, in preference to the holders of Common
     Stock, par value $1.00 per share (the "Common Stock"),  of the Corporation,
     and of any other junior stock,  shall be entitled to receive,  when, as and
     if  declared  by the  Board of  Directors  out of funds of the  Corporation
     legally available for the payment of dividends, quarterly dividends payable
     in cash on March 31,  June 30,  September  30 and  December 31 in each year
     (each such date being referred to herein as a "Quarterly  Dividend  Payment
     Date"),  commencing on the first Quarterly  Dividend Payment Date after the
     first  issuance  of a share or  fraction  of a share of Series B  Preferred
     Stock,  in an amount per share  (rounded to the nearest  cent) equal to the
     greater  of  (a)  $100  or (b)  subject  to the  provision  for  adjustment
     hereinafter  set forth,  10,000 times the aggregate per share amount of all
     cash dividends, and 10,000 times the aggregate per share amount (payable in
     kind) of all  non-cash  dividends  or  other  distributions,  other  than a
     dividend  payable  in  shares  of  Common  Stock  or a  subdivision  of the
     outstanding  shares of Common  Stock (by  reclassification  or  otherwise),
     declared on the Common  Stock  since the  immediately  preceding  Quarterly
     Dividend  Payment  Date or, with  respect to the first  Quarterly  Dividend
     Payment Date,  since the first issuance of any share or fraction of a share
     of Series B Preferred Stock. In the event the Corporation shall at any time
     declare or pay any dividend on the Common Stock payable in shares of Common
     Stock,  or  effect  a  subdivision,  combination  or  consolidation  of the
     outstanding shares of Common Stock (by  reclassification  or otherwise than
     by  payment  of a  dividend  in shares of Common  Stock)  into a greater or
     lesser number of shares of Common Stock,  then in each such case the amount
     to which  holders  of shares  of Series B  Preferred  Stock  were  entitled
     immediately prior to such event under clause (b) of the preceding  sentence
     shall be adjusted by multiplying  such amount by a fraction,  the numerator
     of which is the number of shares of Common  Stock  outstanding  immediately
     after  such event and the  denominator  of which is the number of shares of
     Common Stock that were outstanding  immediately prior to such event. In the
     event the Corporation  shall at any time declare or pay any dividend on the
     Series B Preferred Stock payable in shares of Series B Preferred  Stock, or
     effect a  subdivision,  combination  or  consolidation  of the  outstanding
     shares of Series B Preferred Stock (by  reclassification  or otherwise than
     by payment  of a dividend  in shares of Series B  Preferred  Stock)  into a
     greater or lesser  number of shares of Series B  Preferred  Stock,  then in
     each such case the amount to which  holders of shares of Series B Preferred
     Stock were entitled immediately prior to such event under clause (b) of the
     first sentence of this Section 2(A) shall be adjusted by  multiplying  such
     amount by a  fraction,  the  numerator  of which is the number of shares of
     Series B Preferred Stock that were  outstanding  immediately  prior to such
     event  and the  denominator  of which is the  number  of shares of Series B
     Preferred Stock outstanding immediately after such event.

            (B)     The Corporation shall declare a dividend or distribution on
     the Series B Preferred  Stock as provided in paragraph  (A) of this Section
     immediately after it declares a dividend or distribution on the Common

                                       5



     Stock  (other  than a dividend  payable in shares of Common  Stock) and the
     Corporation  shall  pay  such  dividend  or  distribution  on the  Series B
     Preferred Stock before the dividend or distribution  declared on the Common
     Stock is paid or set apart;  provided  that,  in the event no  dividend  or
     distribution shall have been declared on the Common Stock during the period
     between  any  Quarterly  Dividend  Payment  Date  and the  next  subsequent
     Quarterly Dividend Payment Date, a dividend of $100 per share on the Series
     B  Preferred  Stock  shall  nevertheless  be  payable  on  such  subsequent
     Quarterly Dividend Payment Date.

            (C)     Dividends shall begin to accrue and be cumulative on
     outstanding  shares of Series B Preferred Stock from the Quarterly Dividend
     Payment Date next  preceding  the date of issue of such shares,  unless the
     date of issue of such  shares  is prior to the  record  date for the  first
     Quarterly  Dividend  Payment Date,  in which case  dividends on such shares
     shall begin to accrue from the date of issue of such shares,  or unless the
     date of issue is a Quarterly  Dividend  Payment Date or is a date after the
     record  date  for the  determination  of  holders  of  shares  of  Series B
     Preferred  Stock  entitled to receive a quarterly  dividend and before such
     Quarterly  Dividend  Payment Date, in either of which events such dividends
     shall  begin to  accrue  and be  cumulative  from such  Quarterly  Dividend
     Payment  Date.  Accrued  but  unpaid  dividends  shall  not bear  interest.
     Dividends paid on the shares of Series B Preferred  Stock in an amount less
     than the total amount of such  dividends at the time accrued and payable on
     such shares shall be allocated pro rata on a share-by-share basis among all
     such  shares  at the time  outstanding.  The Board of  Directors  may fix a
     record  date  for the  determination  of  holders  of  shares  of  Series B
     Preferred  Stock entitled to receive  payment of a dividend or distribution
     declared thereon, which record date shall be not more than 60 days prior to
     the date fixed for the payment thereof.

     Section 3.     Voting Rights. The holders of shares of Series B Preferred
     Stock shall have the following voting rights:

            (A)     Subject to the provision for adjustment hereinafter set
     forth,  each share of Series B  Preferred  Stock  shall  entitle the holder
     thereof  to  10,000  votes  on  all  matters  submitted  to a  vote  of the
     stockholders of the Corporation.  In the event the Corporation shall at any
     time declare or pay any  dividend on the Common Stock  payable in shares of
     Common Stock, or effect a subdivision,  combination or consolidation of the
     outstanding shares of Common Stock (by  reclassification  or otherwise than
     by  payment  of a  dividend  in shares of Common  Stock)  into a greater or
     lesser number of shares of Common Stock,  then in each such case the number
     of votes per share to which  holders of shares of Series B Preferred  Stock
     were  entitled  immediately  prior  to such  event  shall  be  adjusted  by
     multiplying such number by a fraction, the numerator of which is the number
     of shares of Common Stock outstanding  immediately after such event and the
     denominator  of which is the  number of shares  of Common  Stock  that were
     outstanding  immediately  prior to such event. In the event the Corporation
     shall at any time  declare or pay any  dividend  on the Series B  Preferred
     Stock  payable  in  shares  of  Series  B  Preferred  Stock,  or  effect  a
     subdivision,  combination or  consolidation  of the  outstanding  shares of
     Series B Preferred Stock (by  reclassification or otherwise than by payment
     of a dividend in shares of Series B Preferred Stock) into a greater or

                                       6



     lesser number of shares of Series B Preferred Stock, then in each such case
     the  number  of votes  per  share to which  holders  of  shares of Series B
     Preferred  Stock were  entitled  immediately  prior to such event  shall be
     adjusted by multiplying  such amount by a fraction,  the numerator of which
     is the number of shares of Series B Preferred  Stock that were  outstanding
     immediately  prior to such event and the denominator of which is the number
     of shares of Series B Preferred Stock  outstanding  immediately  after such
     event.

            (B)     Except as otherwise provided herein or by law, the holders
     of shares of Series B  Preferred  Stock and the holders of shares of Common
     Stock and any other capital stock of the Corporation  having general voting
     rights shall vote together as one class on all matters  submitted to a vote
     of stockholders of the Corporation.

            (C)     (i)    If at any time dividends on any Series B Preferred
     Stock  shall be in arrears in an amount  equal to six  quarterly  dividends
     thereon,  the holders of the Series B Preferred Stock, voting as a separate
     series  from all other  series of  Preferred  Stock and  classes of capital
     stock,  shall be entitled to elect two members of the Board of Directors in
     addition to any Directors elected by any other series,  class or classes of
     securities and the authorized  number of Directors  will  automatically  be
     increased  by two.  Promptly  thereafter,  the Board of  Directors  of this
     Corporation shall, as soon as may be practicable, call a special meeting of
     holders  of Series B  Preferred  Stock for the  purpose  of  electing  such
     members of the Board of Directors.  Said special meeting shall in any event
     be held within 45 days of the occurrence of such arrearage.

                    (ii)   During any period when the holders of Series B
     Preferred Stock,  voting as a separate series,  shall be entitled and shall
     have  exercised  their right to elect two  Directors,  then and during such
     time as such right  continues (a) the then  authorized  number of Directors
     shall be  increased  by two,  and the holders of Series B Preferred  Stock,
     voting as a separate  series,  shall be  entitled  to elect the  additional
     Directors so provided for, and (b) each such additional  Director shall not
     be a member  of any  existing  class of the Board of  Directors,  but shall
     serve until the next annual  meeting of  stockholders  for the  election of
     Directors,  or until  his or her  successor  shall  be  elected  and  shall
     qualify,  or until his or her right to hold such office terminates pursuant
     to the provisions of this Section 3 (C).

                    (iii)  A Director elected pursuant to the terms hereof may
     be removed with or without cause by the holders of Series B Preferred Stock
     entitled to vote in an election of such Director.

                    (iv)   If, during any interval between annual meetings of
     stockholders  for the election of Directors and while the holders of Series
     B Preferred  Stock shall be  entitled to elect two  Directors,  there is no
     such Director in office by reason of resignation,  death or removal,  then,
     promptly thereafter, the Board of Directors shall call a special meeting of
     the  holders of Series B Preferred  Stock for the  purpose of filling  such
     vacancy and such  vacancy  shall be filled at such  special  meeting.  Such
     special meeting shall in any event be held within 45 days of the occurrence
     of such vacancy.

                                       7



                    (v)    At such time as the arrearage is fully cured, and all
     dividends  accumulated and unpaid on any shares of Series B Preferred Stock
     outstanding  are paid,  and,  in  addition  thereto,  at least one  regular
     dividend has been paid  subsequent  to curing such  arrearage,  the term of
     office of any  Director  elected  pursuant to this Section 3 (C), or his or
     her successor,  shall automatically terminate, and the authorized number of
     Directors shall automatically decrease by two, the rights of the holders of
     the  shares of the Series B  Preferred  Stock to vote as  provided  in this
     Section  3(C) shall  cease,  subject to renewal  from time to time upon the
     same  terms and  conditions,  and the  holders  of  shares of the  Series B
     Preferred Stock shall have only the limited voting rights  elsewhere herein
     set forth.

            (D)     Except as set forth  herein, or as otherwise provided by
     law,  holders of Series B  Preferred  Stock  shall  have no special  voting
     rights and their consent  shall not be required  (except to the extent they
     are entitled to vote with holders of Common Stock as set forth  herein) for
     taking any corporate action.

     Section 4.     Certain Restrictions

            (A)     Whenever quarterly dividends or other dividends or
     distributions  payable  on the  Series B  Preferred  Stock as  provided  in
     Section 2 above are in arrears, thereafter and until all accrued and unpaid
     dividends and distributions, whether or not declared, on shares of Series B
     Preferred Stock  outstanding  shall have been paid in full, the Corporation
     shall not:

                    (i)    declare or pay dividends, or make any other
     distributions,  on  any  shares  of  stock  ranking  junior  (either  as to
     dividends or upon  liquidation,  dissolution or winding up) to the Series B
     Preferred Stock;

                    (ii)   declare or pay dividends, or make any other
     distributions,  on any shares of stock  ranking  on a parity  (either as to
     dividends or upon liquidation, dissolution or winding up) with the Series B
     Preferred  Stock,  except  dividends paid ratably on the Series B Preferred
     Stock  and all such  parity  stock on which  dividends  are  payable  or in
     arrears in proportion to the total amounts to which the holders of all such
     shares are then entitled;

                    (iii)  redeem or purchase or otherwise acquire for
     consideration shares of any stock ranking junior (either as to dividends or
     upon  liquidation,  dissolution  or winding  up) to the Series B  Preferred
     Stock,  provided that the Corporation  may at any time redeem,  purchase or
     otherwise acquire shares of any such junior stock in exchange for shares of
     any stock of the Corporation ranking junior (either as to dividends or upon
     dissolution, liquidation or winding up) to the Series B Preferred Stock; or

                    (iv)   redeem or purchase or otherwise acquire for
     consideration  any  shares of Series B  Preferred  Stock,  or any shares of
     stock  ranking on a parity  with the Series B  Preferred  Stock,  except in
     accordance  with a purchase  offer made in  writing or by  publication  (as
     determined by the Board of Directors) to all holders of such shares upon

                                       8



     such terms as the Board of Directors, after consideration of the respective
     annual  dividend  rates and other  relative  rights and  preferences of the
     respective series and classes, shall determine in good faith will result in
     fair and equitable treatment among the respective series or classes.

            (B)     The Corporation shall not permit any subsidiary of the
     Corporation to purchase or otherwise  acquire for  consideration any shares
     of stock of the Corporation  unless the Corporation  could, under paragraph
     (A) of this  Section 4 purchase or  otherwise  acquire  such shares at such
     time and in such manner.

     Section  5.    Reacquired Shares.  Any shares of Series B  Preferred  Stock
     purchased or otherwise acquired by the Corporation in any manner whatsoever
     shall be retired and cancelled promptly after the acquisition  thereof. All
     such shares shall upon their  cancellation  become  authorized but unissued
     shares of  Preferred  Stock and may be  reissued as part of a new series of
     Preferred Stock subject to the conditions and  restrictions on issuance set
     forth herein, or in any other Certificate of Designation  creating a series
     of Preferred Stock or any similar stock or as otherwise required by law.

     Section 6.     Liquidation, Dissolution or Winding Up.

            (A)     Upon any liquidation, dissolution or winding up of the
     Corporation,  no distribution shall be made (1) to the holders of shares of
     stock  ranking  junior  (either  as  to  dividends  or  upon   liquidation,
     dissolution  or winding up) to the Series B Preferred  Stock unless,  prior
     thereto,  the  holders  of shares of Series B  Preferred  Stock  shall have
     received  $100 per  share,  plus an  amount  equal to  accrued  and  unpaid
     dividends and distributions  thereon,  whether or not declared, to the date
     of such payment,  provided that the holders of shares of Series B Preferred
     Stock shall be entitled to receive an aggregate  amount per share,  subject
     to the  provision for  adjustment  hereinafter  set forth,  equal to 10,000
     times the aggregate amount to be distributed per share to holders of shares
     of Common  Stock,  or (2) to the  holders  of shares of stock  ranking on a
     parity (either as to dividends or upon liquidation,  dissolution or winding
     up) with the Series B Preferred Stock, except distributions made ratably on
     the Series B Preferred Stock and all such parity stock in proportion to the
     total  amounts to which the  holders of all such shares are  entitled  upon
     such liquidation, dissolution or winding up.

            (B)     Neither the consolidation,  merger or other business
     combination of the Corporation  with or into any other  corporation nor the
     sale,  lease,  exchange or  conveyance  of all or any part of the property,
     assets or business of the Corporation  shall be deemed to be a liquidation,
     dissolution or winding up of the  Corporation  for purposes of this Section
     6.

            (C)     In the event the Corporation shall at any time declare or
     pay any dividend on the Common Stock payable in shares of Common Stock,  or
     effect a  subdivision,  combination  or  consolidation  of the  outstanding
     shares of Common Stock (by reclassification or otherwise than by payment of
     a dividend in shares of Common  Stock)  into a greater or lesser  number of
     shares of Common Stock, then in each such case the aggregate amount to

                                       9



     which  holders  of  shares  of  Series  B  Preferred  Stock  were  entitled
     immediately  prior  to such  event  under  the  proviso  in  clause  (1) of
     paragraph  (A) of this  Section 6 shall be  adjusted  by  multiplying  such
     amount by a  fraction  the  numerator  of which is the  number of shares of
     Common Stock  outstanding  immediately after such event and the denominator
     of which is the  number of shares of  Common  Stock  that were  outstanding
     immediately  prior to such event. In the event the Corporation shall at any
     time declare or pay any dividend on the Series B Preferred Stock payable in
     shares of Series B Preferred Stock, or effect a subdivision, combination or
     consolidation  of the  outstanding  shares of Series B Preferred  Stock (by
     reclassification  or  otherwise  than by payment of a dividend in shares of
     Series B  Preferred  Stock)  into a greater  or lesser  number of shares of
     Series B Preferred  Stock,  then in each such case the aggregate  amount to
     which  holders  of  shares  of  Series  B  Preferred  Stock  were  entitled
     immediately  prior  to such  event  under  the  proviso  in  clause  (1) of
     paragraph  (A) of this  Section 6 shall be  adjusted  by  multiplying  such
     amount by a  fraction,  the  numerator  of which is the number of shares of
     Series B Preferred Stock that were  outstanding  immediately  prior to such
     event  and the  denominator  of which is the  number  of shares of Series B
     Preferred Stock outstanding immediately after such event.

     Section 7.     Consolidation, Merger, etc. Notwithstanding anything to the
     contrary  contained  herein,  in case the Corporation  shall enter into any
     consolidation, merger, combination or other transaction in which the shares
     of  Common  Stock  are  exchanged  for  or  changed  into  other  stock  or
     securities,  cash  and/or  any other  property,  then in any such case each
     share of  Series B  Preferred  Stock  shall at the same  time be  similarly
     exchanged or changed into an amount per share, subject to the provision for
     adjustment  hereinafter  set  forth,  equal to 10,000  times the  aggregate
     amount of stock,  securities,  cash and/or any other  property  (payable in
     kind),  as the case may be,  into  which or for which  each share of Common
     Stock is changed or exchanged.  In the event the  Corporation  shall at any
     time declare or pay any  dividend on the Common Stock  payable in shares of
     Common Stock or effect a subdivision,  combination or  consolidation of the
     outstanding shares of Common Stock (by  reclassification  or otherwise than
     by  payment  of a  dividend  in shares of Common  Stock)  into a greater or
     lesser number of shares of Common Stock,  then in each such case the amount
     set forth in the preceding  sentence with respect to the exchange or change
     of shares of Series B Preferred Stock shall be adjusted by multiplying such
     amount by a  fraction,  the  numerator  of which is the number of shares of
     Common Stock  outstanding  immediately after such event and the denominator
     of which is the  number of shares of  Common  Stock  that were  outstanding
     immediately  prior to such event. In the event the Corporation shall at any
     time declare or pay any dividend on the Series B Preferred Stock payable in
     shares of Series B Preferred Stock, or effect a subdivision, combination or
     consolidation  of the  outstanding  shares of Series B Preferred  Stock (by
     reclassification  or  otherwise  than by payment of a dividend in shares of
     Series B  Preferred  Stock)  into a greater  or lesser  number of shares of
     Series B  Preferred  Stock,  then in each such case the amount set forth in
     the first sentence of this Section 7 with respect to the exchange or change
     of shares of Series B Preferred Stock shall be adjusted by multiplying such
     amount by a  fraction,  the  numerator  of which is the number of shares of
     Series B Preferred Stock that were  outstanding  immediately  prior to such

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     event  and the  denominator  of which is the  number  of shares of Series B
     Preferred Stock outstanding immediately after such event.

     Section 8.     No Redemption.  The shares of Series B Preferred Stock shall
     not be redeemable.

     Section 9.     Rank.  The Series B Preferred Stock shall rank, with respect
     to the payment of dividends and the  distribution of assets,  junior to all
     series of any other class of the  Preferred  Stock issued  either before or
     after the issuance of the Series B Preferred Stock, unless the terms of any
     such series shall provide otherwise.

     Section 10.    Amendment.  The Certificate of Incorporation of the
     Corporation shall not be amended in any manner which would materially alter
     or change  the  powers,  preferences or special  rights of the  Series B
     Preferred Stock so as to affect them adversely without the affirmative vote
     of the holders of at least two-thirds of the outstanding shares of Series B
     Preferred Stock, voting together as a single class.

     Section 11.    Fractional Shares.  Series B Preferred Stock may be issued
     in fractions of a share which shall  entitle the holder,  in  proportion to
     such  holder's  fractional  shares,  to  exercise  voting  rights,  receive
     dividends,  participate in distributions  and have the benefit of all other
     rights of holders of Series B Preferred Stock.

     FIFTH:         The following provisions are inserted for the management of
the  business  and for the  conduct of the affairs of the  Corporation,  and for
further  definition,  limitation and regulation of the powers of the Corporation
and of its directors and stockholders:

     (1)  Election of directors need not be by ballot except only as the By-Laws
          may so provide.

     (2)  In  furtherance  of and  not in  limitation  of  powers  conferred  by
          statute,  it is  further  provided  that  the  Board of  Directors  is
          expressly  authorized  to adopt,  amend or repeal  the  By-Laws of the
          Corporation.

     (3)  (a)     The Corporation shall indemnify any person who was or is a
          party or is threatened to be made a party to any  threatened,  pending
          or completed  action,  suit or proceeding,  whether  civil,  criminal,
          administrative or investigative (except as otherwise provided herein),
          by reason of the fact that he or she is or was a  director  or officer
          of  the  Corporation,  or is or was  serving  at  the  request  of the
          Corporation   as  a  director  or  officer  of  another   corporation,
          partnership,   joint  venture,  trust  or  other  enterprise,  against
          expenses (including  attorneys' fees),  judgments,  fines, and amounts
          paid in settlement  actually and reasonably  incurred by him or her in
          connection with such action,  suit or proceeding if he or she acted in
          good faith and in a manner he or she  reasonably  believed to be in or
          not opposed to the best interests of the Corporation, and with respect
          to any  criminal  action or  proceeding,  had no  reasonable  cause to
          believe his or her conduct was unlawful.

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          (b)     In the case of any action or suit by or in the right of the
          Corporation  to procure a judgment  in its favor,  no  indemnification
          shall be made (i) except for expenses  (including  attorneys' fees) or
          (ii) in respect of any claim,  issue or matter as to which such person
          shall have been  adjudged to be liable to the  corporation  unless and
          only to the extent  that the Court of  Chancery  or the court in which
          such action or suit was brought shall determine upon application that,
          despite  the  adjudication  of  liability  but  in  view  of  all  the
          circumstances  of the  case,  such  person is  fairly  and  reasonably
          entitled to indemnity for such expenses which the Court of Chancery or
          such other court shall deem proper.

          (c)     To the extent that a director or officer of the Corporation
          has been  successful  on the  merits or  otherwise  in  defense of any
          action,  suit or proceeding  referred to in subsections (a) or (b), or
          in defense of any claim,  issue or matter therein,  he or she shall be
          indemnified against expenses (including  attorneys' fees) actually and
          reasonably incurred by him or her in connection therewith.

          (d)     Any  indemnification  under  subsections (a) or (b) (unless
          ordered  by a  court)  shall  be  made  by  the  Corporation  only  as
          authorized   in  the   specific   case  upon  a   determination   that
          indemnification   of  the   director  or  officer  is  proper  in  the
          circumstances  because he or she has met the  applicable  standard  of
          conduct set forth in subsections (a) and (b). Such determination shall
          be (i) by the  Board  of  Directors  by a  majority  vote of a  quorum
          consisting of directors  who were not parties to such action,  suit or
          proceeding,  (ii) if such a  quorum  is not  obtainable,  or,  even if
          obtainable  a  quorum  of  disinterested   directors  so  directs,  by
          independent  legal  counsel  in a  written  opinion,  or  (iii) by the
          stockholders.

          (e)     Expenses incurred in defending a civil or criminal action,
          suit or proceeding  may be paid by the  Corporation  in advance of the
          final  disposition of such action,  suit or proceeding upon receipt of
          an  undertaking  by or on behalf of the  director  or officer to repay
          such amount if it shall ultimately be determined that he or she is not
          entitled to be  indemnified  by the  Corporation as authorized in this
          section.

          (f)     The indemnification and advancement of expenses provided by
          this  section  shall not be deemed  exclusive  of any other  rights to
          which those seeking  indemnification or advancement of expenses may be
          entitled  under  any  bylaw,   agreement,   vote  of  stockholders  or
          disinterested directors or otherwise,  both as to action in his or her
          official  capacity and as to action in another  capacity while holding
          such office,  and shall continue as to a person who has ceased to be a
          director  or  officer  and shall  inure to the  benefit  of the heirs,
          executors and administrators of such person.

     SIXTH:       The Corporation reserves the right to amend, alter, change or
repeal any  provision  contained in this  Certificate  of  Incorporation  in the
manner now or hereafter  prescribed by law, and all rights  conferred  herein on
stockholders are subject to this reserved power.

                                       12



     SEVENTH:     Except to the extent that the General Corporation Law of
Delaware  prohibits the elimination or limitation of liability of directors for,
breaches of fiduciary duty, no director of the  Corporation  shall be personally
liable to the  Corporation  or its  stockholders  for  monetary  damages for any
breach of  fiduciary  duty as a director  notwithstanding  any  provision of law
imposing such  liability.  No amendment to or repeal of this Article shall apply
to or have any effect on the  liability or alleged  liability of any director of
the  Corporation  for or with respect to any arts or omissions of such  director
occurring prior to such amendment or repeal."

     IN WITNESS WHEREOF, said Thermo Electron Corporation has caused this
certificate to be signed by George N. Hatsopoulos, its Chairman and Chief
Executive Officer, and attested by Sandra L. Lambert, its Secretary, this 28th
day of May, 1999.

                                            THERMO ELECTRON CORPORATION



                                            By:  /s/ George N. Hatsopoulos
                                            ------------------------------------
                                            Chairman and Chief Executive Officer


ATTEST:

By:  /s/ Sandra L. Lambert
     --------------------------
     Secretary


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