Calculating Machine Components
notes: label: Description
content: These objects were collected by Brooklyn high school teacher and historian of mathematics L. Leland Locke. The metal shaft has six brass discs on it. A steel ring is between each of the discs. Each ring has four protrusions. Three are grouped together, and one is opposite the other three. The single protrusion is stamped with a number. Each disc has nine retractable pins. Rotating the rings sets the number of pins that protrude. Each disc also has two pins that protrude at all times. In addition to the six discs on the shaft, there are six other brass discs. Two of them have rings attached and pins. These rings are numbered 7 and 9. A ninth ring (without a disc) is numbered 8. The four brass discs without rings are numbered on the inside 8, 10, 11, and 12. Number 8 is cut to hold retractable pins, the other three discs are not. There are five miscellaneous smaller pieces.
label: Location
content: Currently not on view
topic: label: Subject
content: Mathematics
setName: label: See more items in
content: Medicine and Science: Mathematics
label: See more items in
content: Calculating Machines
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content: Science & Mathematics
creditLine: label: Credit Line
content: Gift of L. Leland Locke
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1983.3003.031
label: nonaccession number
content: 1983.3003
label: catalog number
content: 1983.3003.031
objectType: label: Object Name
content: calculating machine components
physicalDescription: label: Physical Description
content: steel (overall material)
label: Physical Description
content: brass (overall material)
label: Measurements
content: overall: 10 cm x 19.5 cm x 10 cm; 3 15/16 in x 7 11/16 in x 3 15/16 in