Comptograph Model 3A
date: label: date made
content: 1910
name: label: maker
content: Comptograph Company
notes: label: Description
content: This full keyboard printing manually operated adding machine has a metal case painted black, and nine columns of black and white plastic keys, colored to represent cents, dollars up to 999 dollars, thousands of dollars up to 999,0000 dollars, and millions of dollars. Complementary digits are indicated on the keys. A red button is at the base of each column of keys. In front of the keyboard is a row of nine number dials, covered with glass. At the front of the machine is a row of eight metal levers that may relate to subtraction. The total/error/normal, subtotal, and carriage lock levers are along the right of the machine, somewhat below the keyboard. A crank on the right operates the machine. The printing mechanism, wide black metal carriage, and serrated edge for tearing a paper tape are at the back. The machine is extremely heavy.
label: Description
content: The machine is marked on the front: Comptograph (/) Co. (/) CHICAGO, U.S.A. It is marked on the back: MODEL 3A (/) PATENTED (/) NOV. 25. 1890. It is also marked there: NOV. 2. 1909. These are the first and last patent dates listed. It also is marked there: OTHER PATENTS PENDING. It is also marked there: PATTERN NO 16.
label: Description
content: This model is from the collection of Felt & Tarrant Manufacturing Company.
label: Location
content: Currently not on view
place: label: place made
content: United States: Illinois, Chicago
topic: label: Subject
content: Mathematics
setName: label: See more items in
content: Medicine and Science: Mathematics
label: See more items in
content: Adding Machines
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content: Science & Mathematics
creditLine: label: Credit Line
content: Gift of Victor Comptometer Corporation
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: MA.323635
label: catalog number
content: 323635
label: accession number
content: 250163
objectType: label: Object Name
content: adding machine
physicalDescription: label: Physical Description
content: iron (overall material)
label: Physical Description
content: plastic (overall material)
label: Physical Description
content: steel (overall material)
label: Physical Description
content: glass (overall material)
label: Measurements
content: overall: 34 cm x 49 cm x 47.5 cm; 13 3/8 in x 19 9/32 in x 18 11/16 in