IBM Verifier for Punched Cards
date: label: date made
content: ca 1935
name: label: maker
content: International Business Machines Corporation
notes: label: Description
content: This key-driven, manual verifier has 15 black rubber keys. Twelve are for the 12 columns on a punch card. These are labeled from 0 to 9, X, and blank. Two other keys move the card one space, and the last key releases the card. Cards are fed manually from the left. A mechanism at the center of the machine senses whether or not a hole has been punched in a given line. If one depresses a key corresponding to a hole punched on the card, the card advances one place to the left. If the hole on the card does not match what is punched, the card does not move. Depressing the blank key at the front of the verifier then cuts a hole at the bottom of the column in which the error occurs. Erroneous cards are then retyped on a card punch. If the hole and the key typed match, the card advances one column.
label: Description
content: A mark stamped on the base of the machine toward the left reads: 05111993-A0.
label: Description
content: IBM introduced verifiers as part of its line of punch card equipment around 1917. Cards with 12 columns date from the early 1930s onward.
label: Description
content: Reference:
label: Description
content: C. J. Basche, L. R. Johnson, J. H. Palmer and E. W. Pugh, <I>IBM’s Early Computers</I>, Cambridge: MIT Press, 1986, pp. 7–8, 11.
label: Location
content: Currently not on view
place: label: place made
content: United States: New York, Endicott
topic: label: web subject
content: Mathematics
setName: label: See more items in
content: Medicine and Science: Mathematics
label: See more items in
content: Computers & Business Machines
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content: Tabulating Equipment
creditLine: label: Credit Line
content: Gift of John T. Welch
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1979.0931.01
label: accession number
content: 1979.0931
label: catalog number
content: 1979.0931.01
objectType: label: Object Name
content: verifier
physicalDescription: label: Physical Description
content: rubber (overall material)
label: Physical Description
content: metal (overall material)
label: Measurements
content: overall: 15 cm x 44.5 cm x 14 cm; 5 29/32 in x 17 17/32 in x 5 1/2 in