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.

Date Made: ca 1960

Location: Currently not on view

Place Made: United States

Subject: Mathematics

See more items in: Medicine and Science: Mathematics, Adder, Science & Mathematics


Exhibition Location:

Credit Line: Gift of Frank M. Graves

Data Source: National Museum of American History

Id Number: 1979.0601.01Accession Number: 1979.0601Catalog Number: 1979.0601.01

Object Name: adder

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

Guid: http://n2t.net/ark:/65665/ng49ca746a5-13ad-704b-e053-15f76fa0b4fa

Record Id: nmah_690266

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