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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 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
harmonic analyzer

harmonic analyzer

Zdenek Trnka
1947
Harvard Mark II final models of relays

Harvard Mark II final models of relays

Harvard Computation Laboratory
1947
Harvard Mark IV memory register, word "111"

Harvard Mark IV memory register, word "111"

Harvard Computation Laboratory
1949-1950
IBM ASCC-Harvard Mark I photo album

IBM ASCC-Harvard Mark I photo album

International Business Machines Corporation
1944
IBM ASCC-Mark I cams, counters, and relays

IBM ASCC-Mark I cams, counters, and relays

International Business Machines Corporation
1939-1944
IBM ASCC-Mark I card weight, paper guide, two multiprong relays

IBM ASCC-Mark I card weight, paper guide, two multiprong relays

International Business Machines Corporation
circa 1944
IBM ASCC-Mark I chain link

IBM ASCC-Mark I chain link

International Business Machines Corporation
circa 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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