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Harvard IBM Mark I Automatic Sequence Controlled Calculator (7)

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IBM ASCC-Mark I cams, counters, and relays

Heavy piece of apparatus, which would be roughly cubic except for the sloping front. Metal casing on the sides and back, with several interlocking gears on the right side. On the front, near the bottom, is a row of nine white rotating discs, each attached to a toothed wheel. The numbers "1" and "9" are printed on the top and bottom, respectively, on the portion of each disc that is visible. [Presumably the numbers in between are printed on the portion of the discs not in view.] Above the white discs is a row of seventeen thin pieces of silver metal.

Above the thin metal pieces are nine large, black, toothed wheels, each with a curved piece of orange metal to the right of it. Several thin, evenly spaced, bronze colored metal bars run horizontally across the nine orange pieces of metal, with a black bolt fastening them to each. Thin, curved metal rods run along the left of each orange piece of metal, and are bolted to the bottom.

Above the orange bars is a horizontal brown metal bar, with ten bronze colored bolts on the front of it. At the very top of the apparatus is a row of eight brown, rectangular pieces of metal, each bolted to a silver piece of metal that extends behind the instrument, and another piece of brown metal.

At the bottom right of the instrument is a small, silver metal ledge with a black cylinder standing on it connected to a black wire. Beside the black cylinder is a front fracing metal rectangle with two bronze pieces of metal, potentially binding posts, attached to it.

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 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
computer genealogy poster, 1600 - 1945

computer genealogy poster, 1600 - 1945

Digital Equipment Corporation
circa 1980
IBM ASCC-Harvard Mark I photo album

IBM ASCC-Harvard Mark I photo album

International Business Machines Corporation
1944
IBM ASCC-Mark I model 5 single coil

IBM ASCC-Mark I model 5 single coil

International Business Machines Corporation
circa 1944
IBM ASCC-Mark I model 6 latch

IBM ASCC-Mark I model 6 latch

International Business Machines Corporation
circa 1944
IBM Automatic Sequence Controlled Calculator (ASCC)- Harvard Mark I

IBM Automatic Sequence Controlled Calculator (ASCC)- Harvard Mark I

International Business Machines Corporation
1939-1944
periscope used in Mark I to deflect a light beam

periscope used in Mark I to deflect a light beam

International Business Machines Corporation
1940-1945
Scribola adding and printing machine

Scribola adding and printing machine

Ruthardt & Company
1917-1927
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