Kalkometer

Description
This notched band adder has a metal front and back, painted gray and black. There are eight columns, eight bands, and eight windows below the bands to show the result. The columns are hooked at the top for carrying and at the bottom for borrowing. Along each column, a row of digits along the right provides for addition and, along the left, for subtraction. Across the top is a zeroing bar. The stylus fits across the inside top of a green leather carrying case. The machine is marked: MADE IN U.S.A. It is also marked: Adds [/] Subtracts [/] Aids in Multiplication.
This small device was given to the Smithsonian by economic consultant Frank M. Graves.
Location
Currently not on view
Object Name
adder
date made
ca 1960
Physical Description
metal (overall material)
leather (overall material)
Measurements
overall: 1 cm x 10 cm x 16 cm; 13/32 in x 3 15/16 in x 6 5/16 in
place made
United States
ID Number
1979.0601.01
accession number
1979.0601
catalog number
1979.0601.01
subject
Mathematics
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Adder
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
Gift of Frank M. Graves
Additional Media

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