Analog Computing Component - Component Solver Cam for the Mark I Fire Control Computer

Analog Computing Component - Component Solver Cam for the Mark I Fire Control Computer

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This is a spur gear has spiral cam action, of 3 3/4 turns, on one side. The cam groove is.75 cm. wide and.35 cm. deep. The center hole is 2.2 cm. in diameter, with a.7 cm. hole at 10.8 cm. radius. The opposite side of the gear has three 10-32 tapped holes spaced 115 degrees, 118 degrees, and 127 degrees apart. The gear has a 10” pitch diameter. With this is a heart shaped cam.15 cm. thick. Wire with green residue is twisted through a hole on the edge. A mark stamped into one side reads: 1707862. Another mark in marker reads: ITEM - 2 – 240 Teeth.
Ford Instrument Company designed and produced gears like this one to be part of mechanisms that carried out calculations (analog computing devices). According to the accession file, this one was used in computing various mathematical functions of gun fire control data.
A.B. Clymer, "The Mechanical Analog Computers of Hannibal Ford and William Newell," Annals of the History of Computing, 15, #2, 1993, 19-34.
Accession file.
Currently not on view
Object Name
analog computing component
date made
ca 1940
Ford Instrument Company
place made
United States: New York, Queens, Long Island City
Physical Description
aluminum (overall material)
overall:.8 cm x 5.6 cm x 5.6 cm; 5/16 in x 2 7/32 in x 2 7/32 in
ID Number
catalog number
accession number
Credit Line
Ford Instrument Company, Division of Sperry Rand Corporation
See more items in
Medicine and Science: Mathematics
Data Source
National Museum of American History
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