EXHIBIT 24

                                POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS, which are intended to constitute a General
Power of Attorney pursuant to Article V, Title 15 of the New York General
Obligations Law, that I, Paul F. Forman, 15 Flying Point Road, Stony Creek,
Connecticut 06405, do hereby appoint Richard M. Dressler, vice president,
finance, Zygo Corporation, Laurel Brook Road, Middlefield, Connecticut 06455, my
attorney-in-fact to act in my name, place, and stead in any way which I myself
could do, if I were personally present, with respect to the following matter to
the extent that I am permitted by law to act through an agent: the signing of an
Annual Report on Form 10-K for the fiscal year ended June 30, 2001, and any
amendments thereto, to be filed by Zygo Corporation under Section 13 of the
Securities Exchange Act of 1934, as amended, with the Securities and Exchange
Commission and grant full and unqualified authority to my attorney-in-fact to
delegate the foregoing power to any person or persons whom my attorney-in-fact
shall select.

     This power of attorney shall not be affected by the subsequent disability
or incompetence of the principal.

     To induce any third party to act hereunder, I hereby agree that any third
party receiving a duly executed copy or facsimile of the instrument may act
hereunder, and that revocation or termination hereof shall be ineffective as to
such third party unless and until actual notice or knowledge of such revocation
or termination shall have been received by such third party, and I, for myself
and for my heirs, executors, legal representatives, and assigns, hereby agree to
indemnify and hold harmless any such third party from and against any and all
claims that may arise against such third party by reason of such third party
having relied on the provisions of this instrument.

     IN WITNESS WHEREOF, I have hereunto signed my name this 10th day of July
2001.

                                                   /s/ PAUL FORMAN
                                           -----------------------------
                                                       Paul F. Forman

STATE OF CONNECTICUT, COUNTY OF NEW HAVEN ss.:

     On the 10th day of July 2001, before me personally came Paul F. Forman to
me known, and known to me to be the individual described in, and who executed
the foregoing instrument, and he acknowledged to me that he executed the same.

                                                /s/ FRANCIS L. PUGSLY
                                           -------------------------------
                                                    Notary Public

                                                My commission expires 6/26/03

<PAGE>


                                POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS, which are intended to constitute a General
Power of Attorney pursuant to Article V, Title 15 of the New York General
Obligations Law, that I, R. Clark Harris, NorthEast Ventures Associates, LLC.,
One State Street, Suite 1720, Hartford, Connecticut 06103, do hereby appoint
Richard M. Dressler, vice president, finance, Zygo Corporation, Laurel Brook
Road, Middlefield, Connecticut 06455, my attorney-in-fact to act in my name,
place, and stead in any way which I myself could do, if I were personally
present, with respect to the following matter to the extent that I am permitted
by law to act through an agent: the signing of an Annual Report on Form 10-K for
the fiscal year ended June 30, 2001, and any amendments thereto, to be filed by
Zygo Corporation under Section 13 of the Securities Exchange Act of 1934, as
amended, with the Securities and Exchange Commission and grant full and
unqualified authority to my attorney-in-fact to delegate the foregoing power to
any person or persons whom my attorney-in-fact shall select.

     This power of attorney shall not be affected by the subsequent disability
or incompetence of the principal.

     To induce any third party to act hereunder, I hereby agree that any third
party receiving a duly executed copy or facsimile of the instrument may act
hereunder, and that revocation or termination hereof shall be ineffective as to
such third party unless and until actual notice or knowledge of such revocation
or termination shall have been received by such third party, and I, for myself
and for my heirs, executors, legal representatives, and assigns, hereby agree to
indemnify and hold harmless any such third party from and against any and all
claims that may arise against such third party by reason of such third party
having relied on the provisions of this instrument.

     IN WITNESS WHEREOF, I have hereunto signed my name this 19th day of July
2001.

                                                    /s/ R. CLARK HARRIS
                                             --------------------------------
                                                      R. Clark Harris

STATE OF CONNECTICUT, COUNTY OF NEW HAVEN ss.:

     On the 19th day of July 2001, before me personally came R. Clark Harris to
me known, and known to me to be the individual described in, and who executed
the foregoing instrument, and he acknowledged to me that he executed the same.

                                                    /s/ JOYCE GOLDBERG
                                            ------------------------------------
                                                      Notary Public

                                                   Joyce A. Goldberg
                                            Notary Public, State of Connecticut
                                            My commission expires Dec. 31, 2001

<PAGE>


                                POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS, which are intended to constitute a General
Power of Attorney pursuant to Article V, Title 15 of the New York General
Obligations Law, that I, Seymour E. Liebman, Canon U.S.A., One Canon Plaza, Lake
Success, New York 11042, do hereby appoint Richard M. Dressler, vice president,
finance, Zygo Corporation, Laurel Brook Road, Middlefield, Connecticut 06455, my
attorney-in-fact to act in my name, place, and stead in any way which I myself
could do, if I were personally present, with respect to the following matter to
the extent that I am permitted by law to act through an agent: the signing of an
Annual Report on Form 10-K for the fiscal year ended June 30, 2001, and any
amendments thereto, to be filed by Zygo Corporation under Section 13 of the
Securities Exchange Act of 1934, as amended, with the Securities and Exchange
Commission and grant full and unqualified authority to my attorney-in-fact to
delegate the foregoing power to any person or persons whom my attorney-in-fact
shall select.

     This power of attorney shall not be affected by the subsequent disability
or incompetence of the principal.

     To induce any third party to act hereunder, I hereby agree that any third
party receiving a duly executed copy or facsimile of the instrument may act
hereunder, and that revocation or termination hereof shall be ineffective as to
such third party unless and until actual notice or knowledge of such revocation
or termination shall have been received by such third party, and I, for myself
and for my heirs, executors, legal representatives, and assigns, hereby agree to
indemnify and hold harmless any such third party from and against any and all
claims that may arise against such third party by reason of such third party
having relied on the provisions of this instrument.

     IN WITNESS WHEREOF, I have hereunto signed my name this 11th day of July
2001.

                                                   /s/ SEYMOUR E. LIEBMAN
                                                 ------------------------------
                                                     Seymour E. Liebman

STATE OF NEW YORK, COUNTY OF NASSAU ss.:

     On the 11th day of July 2001, before me personally came Seymour E. Liebman
to me known, and known to me to be the individual described in, and who executed
the foregoing instrument, and he acknowledged to me that he executed the same.

                                                    /s/ STEVEN B. BECKER
                                               --------------------------------
                                                        Notary Public

                                                       STEVEN B. BECKER
                                               Notary Public, State of New York
                                                       No. 02BE6002184
                                                  Qualified in Nassau County
                                               Commission expires Feb. 2, 2002

<PAGE>


                                POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS, which are intended to constitute a General
Power of Attorney pursuant to Article V, Title 15 of the New York General
Obligations Law, that I, Robert G. McKelvey, George McKelvey Co., Inc., 529
Washington Boulevard, Sea Girt, New Jersey 08759, do hereby appoint Richard M.
Dressler, vice president, finance and administration, Zygo Corporation, Laurel
Brook Road, Middlefield, Connecticut 06455, my attorney-in-fact to act in my
name, place, and stead in any way which I myself could do, if I were personally
present, with respect to the following matter to the extent that I am permitted
by law to act through an agent: the signing of an Annual Report on Form 10-K for
the fiscal year ended June 30, 2001, and any amendments thereto, to be filed by
Zygo Corporation under Section 13 of the Securities Exchange Act of 1934, as
amended, with the Securities and Exchange Commission and grant full and
unqualified authority to my attorney-in-fact to delegate the foregoing power to
any person or persons whom my attorney-in-fact shall select.

     This power of attorney shall not be affected by the subsequent disability
or incompetence of the principal.

     To induce any third party to act hereunder, I hereby agree that any third
party receiving a duly executed copy or facsimile of the instrument may act
hereunder, and that revocation or termination hereof shall be ineffective as to
such third party unless and until actual notice or knowledge of such revocation
or termination shall have been received by such third party, and I, for myself
and for my heirs, executors, legal representatives, and assigns, hereby agree to
indemnify and hold harmless any such third party from and against any and all
claims that may arise against such third party by reason of such third party
having relied on the provisions of this instrument.

     IN WITNESS WHEREOF, I have hereunto signed my name this 13th day of July
2001.

                                                   /s/ ROBERT G. McKELVEY
                                            -----------------------------------
                                                    Robert G. McKelvey

STATE OF NEW JERSEY, COUNTY OF MONMOUTH ss.:

     On the 13th day of July 2001, before me personally came Robert G. McKelvey
to me known, and known to me to be the individual described in, and who executed
the foregoing instrument, and he acknowledged to me that he executed the same.

                                                   /s/ ANDREA E. MAICHIN
                                             ----------------------------------
                                                       Notary Public

                                                     ANDREA E. MAICHIN
                                                Notary Public of New Jersey
                                             Commission Expires April 19, 2006

<PAGE>


                                POWER OF ATTORNEY

     KNOW ALL MEN BY THESE PRESENTS, which are intended to constitute a General
Power of Attorney pursuant to Article V, Title 15 of the New York General
Obligations Law, that I, Robert B. Taylor, Colonial Williamsburg Foundation,
Goodwin Building, 134 North Henry Street, Williamsburg, VA 23187, do hereby
appoint Richard M. Dressler, vice president, finance, Zygo Corporation, Laurel
Brook Road, Middlefield, Connecticut 06455, my attorney-in-fact to act in my
name, place, and stead in any way which I myself could do, if I were personally
present, with respect to the following matter to the extent that I am permitted
by law to act through an agent: the signing of an Annual Report on Form 10-K for
the fiscal year ended June 30, 2001, and any amendments thereto, to be filed by
Zygo Corporation under Section 13 of the Securities Exchange Act of 1934, as
amended, with the Securities and Exchange Commission and grant full and
unqualified authority to my attorney-in-fact to delegate the foregoing power to
any person or persons whom my attorney-in-fact shall select.

     This power of attorney shall not be affected by the subsequent disability
or incompetence of the principal.

     To induce any third party to act hereunder, I hereby agree that any third
party receiving a duly executed copy or facsimile of the instrument may act
hereunder, and that revocation or termination hereof shall be ineffective as to
such third party unless and until actual notice or knowledge of such revocation
or termination shall have been received by such third party, and I, for myself
and for my heirs, executors, legal representatives, and assigns, hereby agree to
indemnify and hold harmless any such third party from and against any and all
claims that may arise against such third party by reason of such third party
having relied on the provisions of this instrument.

     IN WITNESS WHEREOF, I have hereunto signed my name this 6th day of July
2001.

                                                    /s/ ROBERT B. TAYLOR
                                             ---------------------------------
                                                       Robert B. Taylor

STATE OF VIRGINIA, CITY OF WILLIAMSBURG:

     On the 6th day of July 2001, before me personally came Robert B. Taylor to
me known, and known to me to be the individual described in, and who executed
the foregoing instrument, and he acknowledged to me that he executed the same.

                                                   /s/ MARIE A. RANIERI
                                              ---------------------------------
                                                       Notary Public

                                              My Commission Expires 10-31-04