UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                                    FORM 8-A

                FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES
                    PURSUANT TO SECTION 12(b) OR 12(g) OF THE
                         SECURITIES EXCHANGE ACT OF 1934

                           THERMO ELECTRON CORPORATION
             (Exact Name of Registrant as Specified in Its Charter)



                                                                              

                              Delaware                                             04-2209186
              (State of Incorporation of Organization)                          (IRS Employer
                                                                                Identification No.)


                     81 Wyman Street
                        Waltham, MA                                                    02454
----------------------------------------------------------                             -----
  (Address of Principal Executive Offices)                                          (Zip code)


If this form relates to the registration of a              If this form relates to the registration of a 
class of securities pursuant to Section 12(b)              class of securities pursuant to Section 12(g)
of the Exchange Act and is effective                       of the Exchange Act and is effective 
pursuant to General pursuant to General Instruction A.(c), pursuant to General Instruction A.(c), 
please check the following box.         [X]                please check the following box.              [ ]


Securities   Act   registration   statement  file  number  to  which  this  Form
relates:___________ (if applicable)

Securities to be registered pursuant to Section 12(b) of the Act:

                                                          Name of Each Exchange
           Title of Each Class                           on Which Each
           to be so Registered                         Class is to be Registered
           -------------------                         -------------------------

          Preferred Stock Purchase Rights              New York Stock Exchange

Securities to be registered pursuant to Section 12(g) of the Act:  None









Item 1. Description of Registrant's Securities to be Registered.

     On  September  15,  2005,  the  Board  of  Directors  of  Thermo   Electron
Corporation  (the "Company")  declared a dividend  distribution of one preferred
stock  purchase  right (a "Right") for each  outstanding  share of the Company's
common stock, par value $1.00 per share (the "Common Stock"), to stockholders of
record at the close of business on September 29, 2005.  Each Right  entitles the
registered  holder  to  purchase  from  the  Company  a unit  consisting  of one
one-hundred-thousandth  of a share (a "Unit")  of Series B Junior  Participating
Preferred Stock, par value $100 per share (the "Preferred Stock"), at a purchase
price of $200 in cash per Unit,  subject to adjustment  (the "Purchase  Price").
The description and terms of the Rights are set forth in a Rights Agreement (the
"Rights  Agreement")  dated as of  September  15,  2005  between the Company and
American Stock Transfer & Trust Company, as rights agent (the "Rights Agent").

     Initially,  the Rights will be attached  to all Common  Stock  certificates
representing  shares  then  outstanding,  and no  separate  rights  certificates
("Rights  Certificates") will be distributed.  The Rights will separate from the
Common  Stock and a  distribution  date will occur  upon the  earlier of (i) the
close of business on the tenth business day following a public announcement that
a person or group of affiliated or associated  persons (an  "Acquiring  Person")
has acquired,  or obtained the right to acquire,  beneficial ownership of 15% or
more of the outstanding shares of Common Stock (the "Stock  Acquisition  Date"),
or (ii) the close of business on the tenth  business  day (or such later date as
may be  determined by the  Company's  Board of Directors)  after the date that a
tender or exchange offer is commenced by any person,  the  consummation of which
could result in the beneficial  ownership by a person or group of 15% or more of
the shares of Common Stock then  outstanding  (the earlier of (i) and (ii) being
herein referred to as the "Distribution Date"). Until the Distribution Date, (i)
the Rights  will be  evidenced  by the  Common  Stock  certificates  and will be
transferred with and only with such Common Stock  certificates,  (ii) new Common
Stock certificates will contain a notation incorporating the Rights Agreement by
reference and (iii) the surrender  for transfer of any  certificates  for Common
Stock  outstanding  will also  constitute the transfer of the Rights  associated
with the Common Stock represented by such certificate.

     The Rights are not exercisable  until the Distribution Date and will expire
at the close of business on  September  29,  2015,  unless  earlier  redeemed or
exchanged by the Company as described below.

     As soon as practicable  after the Distribution  Date,  Rights  Certificates
will be mailed to  holders  of  record  of the  Common  Stock as of the close of
business  on  the  Distribution  Date  and,  thereafter,   the  separate  Rights
Certificates alone will represent the Rights.  Except as otherwise determined by
the Board of  Directors  and except in  connection  with shares of Common  Stock
issued upon the  exercise  of  employee  stock  options,  issuances  under other
employee  stock  benefit  plans or issuances  upon the  exercise,  conversion or
exchange of securities  issued prior to the  Distribution  Date,  only shares of
Common Stock issued prior to the Distribution Date will be issued with Rights.


     In the event that a person becomes the  beneficial  owner of 15% or more of
the then outstanding shares of Common Stock, except pursuant to an offer for all
outstanding  shares of Common  Stock that at least 75% of the Board of Directors
determines to be fair to, and otherwise in the best  interests of,  stockholders
(a "Permitted Offer"),  each holder of a Right will thereafter have the right to
receive,  upon  exercise,  that number of shares of Common Stock (or, in certain
circumstances,  Units of Preferred Stock, cash,  property or other securities of
the Company) which equals the exercise price of the Right divided by one-half of
the  current  market  price (as defined in the Rights  Agreement)  of the Common
Stock  at the date of the  occurrence  of the  event.  However,  Rights  are not
exercisable  following  the event set forth  above until such time as the Rights
are no longer redeemable by the Company as set forth below.  Notwithstanding any
of the foregoing,  following the occurrence of such event,  all Rights that are,
or  (under  certain  circumstances  specified  in the  Rights  Agreement)  were,
beneficially  owned by any Acquiring Person will be null and void. The event set
forth in this paragraph is referred to as "Section 11(a)(ii) Event."

     For example,  at an exercise price of $200 per Right,  each Right not owned
by an Acquiring  Person (or by certain related  parties)  following an event set
forth in the preceding  paragraph  would entitle its holder to purchase for $200
such number of shares of Common Stock (or other  consideration,  as noted above)
as equals $200  divided by one-half of the current  market  price (as defined in
the Rights Agreement) of the Common Stock.  Assuming that the Common Stock had a
per share  value of $50 at such time,  the holder of each valid  Right  would be
entitled to purchase 8 shares of Common Stock for $200.

     In the event  that,  at any time after any  person has become an  Acquiring
Person,  (i) the Company is acquired in a merger or other  business  combination
transaction in which the Company is not the surviving  corporation or its Common
Stock is changed or  exchanged  (other than a merger  which  follows a Permitted
Offer),  or (ii) 50% or more of the Company's assets or earning power is sold or
transferred,  each holder of a Right (except Rights which  previously  have been
voided as set forth  above)  shall  thereafter  have the right to receive,  upon
exercise,  that number of shares of common stock of the acquiring  company which
equals the exercise price of the Right divided by one-half of the current market
price of such common stock at the date of the occurrence of the event.

     For example,  at an exercise price of $200 per Right,  each Right following
an event  set forth in the  preceding  paragraph  would  entitle  its  holder to
purchase for $200 such number of shares of common stock of the acquiring company
as equals $200  divided by one-half of the current  market  price (as defined in
the Rights Agreement) of such common stock.  Assuming that such common stock had
a per share  value of $50 at such time,  the holder of each valid Right would be
entitled to purchase 8 shares of common stock of the acquiring company for $200.

     At any time after the occurrence of a Section 11(a)(ii) Event, the
Board of Directors of the Company may exchange the Rights (other than Rights
owned by such Acquiring Person that have become void), in whole or in part, at
an exchange ratio of one share of Common Stock, or one one-hundred-thousandth of
a share of Preferred Stock (or of a share of a class or series of the Company's
preferred stock having equivalent rights, preferences and privileges), per Right
(subject to adjustment).


     The Purchase Price payable,  and the number of Units of Preferred  Stock or
other securities or property  issuable,  upon exercise of the Rights are subject
to adjustment from time to time to prevent  dilution (i) in the event of a stock
dividend on, or a subdivision, combination or reclassification of, the Preferred
Stock,  (ii) if holders of the  Preferred  Stock are granted  certain  rights or
warrants to subscribe for Preferred Stock or convertible securities at less than
the current market price of the Preferred  Stock, or (iii) upon the distribution
to  holders  of the  Preferred  Stock of  evidences  of  indebtedness  or assets
(excluding  regular  quarterly  cash  dividends)  or of  subscription  rights or
warrants (other than those referred to above).

     The number of Rights  associated  with each  share of Common  Stock is also
subject to  adjustment  in the event of a stock  split of the Common  Stock or a
stock  dividend on the Common  Stock  payable in Common  Stock or  subdivisions,
consolidations  or  combinations  of Common Stock  occurring,  in any such case,
prior to the Distribution Date.

     Preferred  Stock  purchasable  upon  exercise  of the  Rights  will  not be
redeemable.  Each  share  of  Preferred  Stock  will be  entitled  to a  minimum
preferential  quarterly  dividend payment of $100 per share and will be entitled
to an aggregate  dividend of 100,000  times the  dividend  declared per share of
Common Stock.  In the event of  liquidation,  the holders of the Preferred Stock
will be entitled to a minimum preferential liquidating payment of $100 per share
and will be entitled to an aggregate  payment of 100,000  times the payment made
per share of Common  Stock.  Each share of  Preferred  Stock  will have  100,000
votes,  voting  together  with the Common  Stock.  Finally,  in the event of any
merger,  consolidation or other  transaction in which Common Stock is changed or
exchanged,  each share of  Preferred  Stock will be entitled to receive  100,000
times the amount received per share of Common Stock.  These rights are protected
by customary antidilution provisions.

     Because of the nature of the Preferred  Stock's  dividend,  liquidation and
voting rights, the value of one  one-hundred-thousandth  of a share of Preferred
Stock  purchasable  upon exercise of each Right should  approximate the value of
one share of Common Stock.

     With  certain  exceptions,  no  adjustment  in the  Purchase  Price will be
required  until  cumulative  adjustments  amount to at least 1% of the  Purchase
Price. No fractional Units will be issued and, in lieu thereof, an adjustment in
cash will be made based on the market price of the  Preferred  Stock on the last
trading date prior to the date of exercise.

     At any time until the Stock  Acquisition  Date,  the Company may redeem the
Rights in whole,  but not in part, at a price of $.01 per Right (payable in cash
or stock) (the "Redemption Price").  Immediately upon the action of the Board of
Directors  ordering  redemption of the Rights, the Rights will terminate and the
only right of the holders of Rights will be to receive the Redemption Price.

     Until a Right is  exercised,  the  holder  thereof,  as such,  will have no
rights as a stockholder of the Company, including, without limitation, the right
to vote or to receive  dividends.  While the distribution of the Rights will not
be taxable to stockholders or to the Company,  stockholders may,  depending upon
the circumstances,  recognize taxable income in the event that the Rights become
exercisable  for Common  Stock (or other  consideration)  of the  Company or for



common stock of the acquiring company as set forth above.

     Prior to the  Distribution  Date,  the terms of the Rights  are  subject to
amendment  by the Board of  Directors  without the consent of the holders of the
Rights.  After the  Distribution  Date,  only  limited  terms of the  Rights are
subject to amendment by the Board.

     As long as the Rights are attached to the Common Stock,  one Right (as such
number may be adjusted pursuant to the provisions of the Rights Agreement) shall
be deemed to be delivered  for each share of Common Stock issued or delivered by
the  Company,  except  that  following  the  Distribution  Date and prior to the
expiration or redemption of the Rights,  the Company (a) shall issue Rights only
in respect of shares of common stock  issued upon the exercise of stock  options
or under any employee plan or arrangement,  or upon the exercise,  conversion or
exchange of securities issued before the Distribution Date and (b) may otherwise
issue Rights when it issues Common Stock only if the Board of Directors deems it
to be necessary or  appropriate;  provided  that no Rights will be issued if the
Company is advised by counsel that such issuance would create a significant risk
of material  adverse tax  consequences  to the Company or the  recipient  of the
Rights.

     The Rights  have  certain  anti-takeover  effects.  The  Rights  will cause
substantial  dilution to a person or group that  attempts to acquire the Company
without conditioning the offer on a substantial number of Rights being acquired.
The Rights, however, should not affect any prospective offeror willing to make a
Permitted  Offer.  The  Rights  should  not  interfere  with any merger or other
business combination approved by the Board of Directors of the Company since the
Board  of  Directors  may,  at its  option,  at any time  prior to the  close of
business on the earlier of (i) the Stock  Acquisition Date or (ii) September 29,
2015,  and in certain other  circumstances,  redeem all but not less than all of
the then outstanding Rights at the Redemption Price.

     The Rights Agreement contains a so-called "TIDE" provision,  which requires
that a  shareholder  rights  plan  committee  of the Board of  Directors  of the
Company shall review (not less than once every three years) whether  maintaining
the Rights Agreement continues to be in the best interest of the stockholders.

     The Rights  Agreement  between the Company and the Rights Agent  specifying
the terms of the  Rights,  which  includes  as  Exhibit A, the Terms of Series B
Junior  Participating  Preferred  Stock,  and as  Exhibit  B, the Form of Rights
Certificate,  is filed as Exhibit 1 to this Form 8-A and is incorporated  herein
by reference. The Form of Certificate of Amendment of Certificate of Designation
is filed as Exhibit 2 to this Form 8-A and is incorporated  herein by reference.
The foregoing  description  of the Rights does not purport to be complete and is
qualified in its entirety by reference to such Exhibits.





Item 2. Exhibits.

1    Rights  Agreement,  dated as of September 15, 2005,  by and between  Thermo
     Electron Corporation and American Stock Transfer & Trust Company, as Rights
     Agent,  which  includes  as  Exhibit  A,  the  Terms  of  Series  B  Junior
     Participating  Preferred  Stock,  and as  Exhibit  B,  the  Form of  Rights
     Certificate,  filed as an exhibit to the Company's  Current  Report on Form
     8-K on September 16, 2005.

2    Form of  Certificate  of Amendment of  Certificate  of  Designation  of the
     Series  B  Junior   Participating   Preferred   Stock  of  Thermo  Electron
     Corporation,  filed as an exhibit to the Company's  Current  Report on Form
     8-K on September 16, 2005.






                                    SIGNATURE


         Pursuant to the requirements of Section 12 of the Securities Exchange
Act of 1934, the Registrant has duly caused this registration statement to be
signed on its behalf by the undersigned, thereto duly authorized.


                                        THERMO ELECTRON CORPORATION


Date:    September 16, 2005             By:     /s/ Seth H. Hoogasian           
                                            ------------------------------------
                                        Name:   Seth H. Hoogasian
                                        Title:  Vice President, General Counsel
                                                and Secretary





                                  EXHIBIT INDEX


Exhibit No.                   Description

1    Rights  Agreement,  dated as of September 15, 2005,  by and between  Thermo
     Electron Corporation and American Stock Transfer & Trust Company, as Rights
     Agent,  which  includes  as  Exhibit  A,  the  Terms  of  Series  B  Junior
     Participating  Preferred  Stock,  and as  Exhibit  B,  the  Form of  Rights
     Certificate,  filed as an exhibit to the Company's  Current  Report on Form
     8-K on September 16, 2005.

2    Form of  Certificate  of Amendment of  Certificate  of  Designation  of the
     Series  B  Junior   Participating   Preferred   Stock  of  Thermo  Electron
     Corporation,  filed as an exhibit to the Company's  Current  Report on Form
     8-K on September 16, 2005.