SCM Marchant Model SK Calculating Machine, Deci Magic

This full-keyboard, non-printing electric calculating machine has a gray metal frame and ten columns of light gray number keys. All the keys are the same color. At the base of each column of keys is another key. These keys are numbered from right to left 0 to 9. Each controls a striped metal rod between two columns of keys. When the control key is pushed down, the rod moves up and red stripes show between the keys, between windows in a row of windows at the front of the machine, and between windows in a row of windows directly in back of the keyboard. This indicates a decimal point.
To the right of the number keys are various function keys, including one for squaring numbers. A row of dials in back of the keys indicates the number set up on the keyboard. A row of ten dials at the front of the machine is used to enter a multiplier. A movable carriage at the back has a 20-window result register and an 11-window revolution register. A small lever between each pair of keys on the carriage can slide to reveal a decimal marker.
A mark on the carriage reads: SCM MARCHANT. The serial number, on a metal tag attached to the bottom of the machine, is: SK-661050. A mark on the back of the machine reads: SCM.
Currently not on view
Object Name
calculating machine
date made
SCM Corporation
Physical Description
metal (overall material)
plastic (overall material)
overall: 22 cm x 42 cm x 40.5 cm; 8 21/32 in x 16 17/32 in x 15 15/16 in
ID Number
accession number
maker number
catalog number
Science & Mathematics
Calculating Machines
See more items in
Medicine and Science: Mathematics
Calculating Machines
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
Gift of William L. Jackson
Additional Media

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