<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THERMEDICS
INC.'S QUARTERLY REPORT ON FORM 10-Q FOR THE QUARTER ENDED MARCH 29, 1997 AND IS
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<RESTATED> 
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          JAN-03-1998
<PERIOD-END>                               MAR-29-1997
<CASH>                                         130,252
<SECURITIES>                                    65,272
<RECEIVABLES>                                   63,436
<ALLOWANCES>                                     4,891
<INVENTORY>                                     56,105
<CURRENT-ASSETS>                               325,438
<PP&E>                                          50,560
<DEPRECIATION>                                  28,897
<TOTAL-ASSETS>                                 488,312
<CURRENT-LIABILITIES>                           69,906
<BONDS>                                         73,465
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                         3,685
<OTHER-SE>                                     225,585
<TOTAL-LIABILITY-AND-EQUITY>                   488,312
<SALES>                                         72,057
<TOTAL-REVENUES>                                72,057
<CGS>                                           36,961
<TOTAL-COSTS>                                   36,961
<OTHER-EXPENSES>                                 5,584
<LOSS-PROVISION>                                   202
<INTEREST-EXPENSE>                                 269
<INCOME-PRETAX>                                 26,991
<INCOME-TAX>                                     3,764
<INCOME-CONTINUING>                             21,966
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    21,966
<EPS-PRIMARY>                                      .60
<EPS-DILUTED>                                      .56