Friden Model FT 10 Calculating Machine
date: label: date made
content: 1946
name: label: maker
content: Friden Calculating Machine Company, Inc.
notes: label: Description
content: This full-keyboard electric stepped drum calculating machine is non-printing. It has a metal frame painted gray and ten columns of color-coded light-green and blue-green plastic number keys, with a blank green clearance key at the bottom of each column. Metal rods between the columns of keys turn to serve as decimal markers.
label: Description
content: On the right are two columns of function bars. To the right of these is another column of blue-green keys, with another green clearance key at the bottom. Pushing these keys allows direct multiplication by a single digit. Friden had introduced this feature in its Model F calculating machine. The model FT, of which this is an example, featured division tabulation as well. The company also sold calculating machines in which multiplication by several-digit numbers could occur automatically (see descriptions of the model S 10).
label: Description
content: The movable carriage behind the number keys has an 11-digit multiplier register and a 20-digit result register, both with sliding decimal markers. Plastic buttons above the result register rotate to set up dividends. Ten numbered buttons are under the revolution register. Zeroing knobs for the registers are on the right of the carriage. The machine has four rubber feet.
label: Description
content: The serial number, marked on the bottom of the machine is: FT10-79740. The side and back are marked: FRIDEN. A sticker on the bottom reads: MODEL FT. It also reads: FRIDEN CALCULATING MACHINE CO., INC. (/) MADE IN SAN LEANDRO, CALIFORNIA, U.S.A.. It has the patent numbers: 2,273,857, 2,229,901, and D-103,425.
label: Description
content: The black plastic cover is marked: IBM.
label: Description
content: Date from Ernie Jorgenson.
label: Description
content: References:
label: Description
content: C. M. F. Friden, "Calculating Machine," U.S. Patent 2,273,857, February 24, 1942.
label: Description
content: A. I. Richards, "Calculating Machine," U.S. Patent 2,229,901, January 28, 1941.
label: Description
content: C. M. F. Friden, "Design for a Calculating Machine with Shiftable Carriage," U.S. Design Patent D103425, March 2, 1937.
label: Description
content: E. Jorgenson, </>Friden Age List</I>, Office Machine Americana, p. 2.
label: Location
content: Currently not on view
place: label: place made
content: United States: California, San Leandro
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 The Singer Company, Friden Division
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: MA.334383
label: catalog number
content: 334383
label: accession number
content: 313935
label: maker number
content: FT10-79740
objectType: label: Object Name
content: calculating machine
physicalDescription: label: Physical Description
content: metal (overall material)
label: Physical Description
content: plastic (overall material)
label: Physical Description
content: rubber (overall material)
label: Measurements
content: overall: 21 cm x 46 cm x 34 cm; 8 9/32 in x 18 1/8 in x 13 3/8 in