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9.5-inch telescope objective for finder to 60-inch reflecting telescope

9.5-inch telescope objective for finder to 60-inch reflecting telescope

Andrew A. Common
circa 1889
15.875-inch secondary mirror for 60-inch reflecting telescope

15.875-inch secondary mirror for 60-inch reflecting telescope

Andrew A. Common
circa 1889
astronomical transit

astronomical transit

A. J. Frost
circa 1885
comparative display of old cam with IBM ASCC-Mark I cam

comparative display of old cam with IBM ASCC-Mark I cam

International Business Machines Corporation
1930-1937
comparative display of relays for Harvard Mark I-IV computers

comparative display of relays for Harvard Mark I-IV computers

Harvard Computation Laboratory
1944-1952
comparative display of standard counters and later IBM ASCC-Mark I counters

comparative display of standard counters and later IBM ASCC-Mark I counters

International Business Machines Corporation
1929-1938
comparative display of standard wire contacts and later IBM ASCC-Mark I contacts

comparative display of standard wire contacts and later IBM ASCC-Mark I contacts

International Business Machines Corporation
1929-1938
Dayton balance scale,with glass tray

Dayton balance scale,with glass tray

International Business Machines Corporation
late 19th-early 20th Century
floating-point arithmetic computer chip

floating-point arithmetic computer chip

International Business Machines Corporation
1982
floating-point arithmetic computer chip

floating-point arithmetic computer chip

International Business Machines Corporation
1981-1985
floppy disk drive

floppy disk drive

International Business Machines Corporation
circa 1982
IBM ASCC-Harvard Mark I photo album

IBM ASCC-Harvard Mark I photo album

International Business Machines Corporation
1944
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The Collection of Historical Scientific Instruments
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p. 617-495-2779 • f. 617-496-5794
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