Simplex Calculating Machine

Description:

This key-set, non-printing stepped drum calculating machine has a metal case painted black. Each of the nine columns of keys has nine black plastic keys. Between each row of keys, rods that are black on one side and white on the other serve as decimal markers. The crank for operating the machine angles out of the right side, at the front. A lever near it is marked Repeat in one position and Release in the other. In the front on the left is a lever that may be intended for shifting the carriage. Above the keyboard is a row of nine windows. This indicates a number set on the keys. On the left side is a lever. It is marked Subt.& Div. in one position and Add.& Mult. in the other.

In back of the keyboard is a carriage with two rows of windows. The front row holds nine digits, and the back row, 16. On the right side of the carriage, a zeroing knob ia next to each row of windows. The machine has four rubber feet.

A mark on the left front reads: Simplex. A mark under the carriage on the left side reads: 2741. A paper tag hanging from the object reads: 28.

This machine closely resembles a Record calculating machine. Compare to MA.311949. It is number 28 in the collection of Felt & Tarrant Manufacturing Company.

Reference:

E. Martin, The Calculating Machines (Die Rechenmaschinen), trans. P. A. Kidwell and M. R. Williams, Cambridge: MIT Press, 1992, pp. 274–276.

Date Made: ca 1925

Location: Currently not on view

Place Made: Germany: Berlin, Berlin

Subject: Mathematics

Subject:

See more items in: Medicine and Science: Mathematics, Calculating Machines, Science & Mathematics

Exhibition:

Exhibition Location:

Credit Line: Gift of Victor Comptometer Corporation

Data Source: National Museum of American History

Id Number: MA.323612Accession Number: 250163Catalog Number: 323612

Object Name: calculating machine

Physical Description: brass (overall material)plastic (overall material)steel (overall material)Measurements: overall: 19.7 cm x 45 cm x 35 cm; 7 3/4 in x 17 23/32 in x 13 25/32 in

Guid: http://n2t.net/ark:/65665/ng49ca746a5-11cc-704b-e053-15f76fa0b4fa

Record Id: nmah_690312

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