Victor Model 780 Adding Machine
date: label: date made
content: 1940s
name: label: maker
content: Victor Adding Machine Company
notes: label: Description
content: This ten-key printing manual adding machine has a black plastic top, green plastic keys, and a metal mechanism, handle, and base. The number keys are arranged in a block. To the left of these is a lever used to clear the place indicator. The place indicator is above the keyboard. Numbers with as many as eight digits may be entered. Back near the carriage are two levers. One, on the right, is marked “T” and set forward to obtain totals. It also is marked "S" (the S has faded) and held backward for subtotals. The other, on the left, is adjusted for repetitition ("R") or subtraction ("- (/) T"). The printing mechanism is between these levers, with the paper tape to the back. Results up to nine digits long may be printed. The handle on the right side has a wooden knob painted black. The cover is of black cloth. The serial number, marked on the side of the base, is 531973.
label: Description
content: According to Edwin Darby, this model was introduced in 1938. According to Office Machines Research, Inc., it was introduced in 1940. The serial number suggests that this example was made in 1947.
label: Description
content: References:
label: Description
content: <I>NOMDA’s Blue Book: Approximate January 1st Ages Adding Machines and Calculator Retail Prices</I>, November, 1980, p. 57.
label: Description
content: E. Darby, <I>It All Adds Up: The Growth of Victor Comptometer Corporation</I>, Victor Comptometer Corporation, 1968, pp. 77-90
label: Description
content: Office Machines Research, Inc., section 3,21, February, 1940.
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 Walton G. Banks, Inc.
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1984.0682.01
label: maker number
content: 531973
label: accession number
content: 1984.0682
label: catalog number
content: 1984.0682.01
objectType: label: Object Name
content: adding machine
physicalDescription: label: Physical Description
content: metal (overall material)
label: Physical Description
content: cloth (overall material)
label: Physical Description
content: paper (overall material)
label: Physical Description
content: plastic (overall material)
label: Measurements
content: overall: 18.5 cm x 22.5 cm x 34 cm; 7 9/32 in x 8 27/32 in x 13 3/8 in