Cusip 002539104

Item 1: Reporting Person: Arnhold and S. Bleichroeder, Inc. (Tax Id:134959915)
Item 4: State of New York
Item 5: 350,031
Item 6: None
Item 7: 350,031
Item 8: None
Item 9: 350,031
Item 11: 4.82%
Item 12: BD

Cusip 002539104

Item 1: Reporting Person: Arnhold and S. Bleichroeder Advisers, Inc.
Item 2: State Of New York
Item 5: 350,031
Item 6: None
Item 7: 350,031
Item 8: None
Item 9: 350,031
Item 11: 4.82%
Item 12: IA

Cusip 002539104
Schedule 13 G (Cont.)                        Page 3 of 5

Item 1(a)-  Name of Issuer: Aavid Thermal Technologies, Inc.

Item 1(b)-  Address of Issuer's Principal Executive Offices:

                  One Kool Path
                  Laconia, NH 03247

Item 2(a)- Name of Person Filing: Arnhold and S. Bleichroeder,  Inc. and Arnhold
and S. Bleichroeder Advisers, Inc.

Item 2(b)-  Address of Principal Business Office:    1345 Ave of Americas
                                                              New York, NY 10105

Item 2(c)-  Citizenship: New York, NY, USA (Place of Incorporation)

Item 2(d)-  Title of Class of Securities:      Common Stock

Item 2(e)- Cusip Number: 002539104

Item 3-This statement is being filed pursuant to Rule 13d-1(b).
         The person filing is a:
         (a) Broker or Dealer registered under Section 15 of the act; and
         (e)-Investment Advisor registered under Section 203 of the
                       Investment Advisers Act of 1940.

Item 4(a) Amount beneficially owned: Arnhold and S. Bleichroeder Advisers, Inc.,
a  wholly  owned  subsidiary  of  Arnhold  and  S.  Bleichroeder,  Inc.,  is the
investment adviser for First Eagle Fund of America (the "Fund"). Pursuant to its
advisory agreement with the Fund, Arnhold and S. Bleichroeder Advisers, Inc. has
sole  power  to vote  and  dispose  of the  securities  held by the  Fund and is
therefore  the  beneficial  owner,  for  the  purposes  of  Rule  13d-3,  of the
securities  held by the Fund.  Based upon the foregoing,  each of Arnhold and S.
Bleichroeder and Arnhold and S.  Bleichroeder  Advisers,  Inc. may be considered
the  beneficial  owner,  for the  purpose of Rule  13d-3,  of a total of 350,031
shares of the Issuer's common stock.
 
Item 4(b) - Percent of Class:  4.82%

Item 4(c)- Number of Shares to which A & SB has:  (i)--sole  power to vote or to
direct the vote:  350,031  (ii)-shared  power to vote or to direct the vote: -0-
(iii)sole power to dispose or to direct the disposition of: 350,031  (iv)-shared
power to dispose or to direct the disposition of -0-



Cusip   002539104
Schedule G (Cont.)                                Page 4 of 5


Item 5   -  Ownership of Five Percent or Less of a Class:  YES

Item 6   -  Ownership of More than Five percent on Behalf of Another Person:

         Not Applicable

Item  7-Identification  and  Classification of the Subsidiary Which Acquired the
Security Being Reported on By the Parent Holding Company:

         Not Applicable

Item 8-Identification and Classification of Members of the Group:

         Not Applicable

Item 9-Notice of Dissolution of Group:

         Not Applicable

Item 10  -  Certification:

By signing below I certify  that,  to the best of my knowledge  and belief,  the
securities  referred to above were  acquired in the ordinary  course of business
and were not  acquired for the purpose of and do not have the effect of changing
or  influencing  the  control  of the  issuer  of such  securities  and were not
acquired in connection with or as a participant in any  transaction  having such
purposes or effect.















Cusip   002539104
Schedule G (Cont.)                                Page  5 of 5




                                            SIGNATURE

After  reasonable  inquiry and to the best of my knowledge and belief, I certify
that the information set forth in this statement is true, complete and correct.

            Date: February 12, 1998

         ARNHOLD AND S. BLEICHROEDER, INC.
 

         By:      /S/ Ronald A. Bendelius
         -------------------------------------
                  Ronald A. Bendelius
                  Senior Vice President
 

         By:      /S/ William P Casciani
         -------------------------------
                  William P. Casciani
                  Senior Vice President


         ARNHOLD AND S. BLEICHROEDER ADVISERS, INC.
 

         By:     /S/ Robert Miller
         -------------------------
                  Robert Miller
                  Vice President, Secretary, Treasurer