<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THERMEDICS
INC.'S QUARTERLY REPORT ON FORM 10-Q FOR THE QUARTER ENDED JUNE 28, 1997 AND IS
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<RESTATED> 
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          JAN-03-1998
<PERIOD-END>                               JUN-28-1997
<CASH>                                         168,344
<SECURITIES>                                    57,576
<RECEIVABLES>                                   65,426
<ALLOWANCES>                                     4,851
<INVENTORY>                                     59,905
<CURRENT-ASSETS>                               361,576
<PP&E>                                          52,220
<DEPRECIATION>                                  30,643
<TOTAL-ASSETS>                                 533,903
<CURRENT-LIABILITIES>                           79,011
<BONDS>                                        143,464
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                         3,685
<OTHER-SE>                                     212,085
<TOTAL-LIABILITY-AND-EQUITY>                   533,903
<SALES>                                        148,053
<TOTAL-REVENUES>                               148,053
<CGS>                                           75,101
<TOTAL-COSTS>                                   75,101
<OTHER-EXPENSES>                                11,811
<LOSS-PROVISION>                                   285
<INTEREST-EXPENSE>                                 983
<INCOME-PRETAX>                                 39,659
<INCOME-TAX>                                     8,938
<INCOME-CONTINUING>                             27,472
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    27,472
<EPS-PRIMARY>                                      .75
<EPS-DILUTED>                                      .71