SCM Marchant Model SKA

This full-keyboard non-printing electric calculating machine has a metal frame painted blue and charcoal, and ten columns of color-coded blue-gray and white plastic keys. The rightmost three columns of keys are light blue; the next three, white; the next three, light blue; and the left column, white. Below the number keys is a row of blue keys with the numbers from 0 to 9. In front of them is a register with 10 keys. To the left are blue function keys and bars. Above the number keys is a row of ten windows that show the number entered.
Behind the entry register is a movable carriage with a 20-digit result register and an 11-digit revolution register. The entry register has sliding decimal markers; the registers on the carriage, flipping decimal markers. A socket for a cord is at the back, but no cord is present.
Marks on the sides and back of the machine read: MARCHANT. A mark on the bottom at the front reads: SKA 563169.
For related documents see 313984.02 through 313984.04.
Richard H. Hronik (1911–2003), the donor of this machine, held a number of patents in transportation engineering and did design work relating to railroad systems built for the Indian government. He went on to work for the firm of Melpar as a materials science engineer. He made donations to several Smithsonian units, including Electricity and Civil Engineering.
Electricity Collections, National Museum of American History.
Fédération Nationale des Chambres Syndicales de la Mécanographie, Fédération de Reprise officielle des Machines à Ecrire, Machines à Calculer . . ., Lyon, 1970, p. 71.
Currently not on view
date made
Physical Description
metal (overall material)
rubber (overall material)
plastic (overall material)
overall: 21.3 cm x 41 cm x 40 cm; 8 3/8 in x 16 5/32 in x 15 3/4 in
ID Number
catalog number
accession number
maker number
SKA 563169
Credit Line
Gift of Richard H. Hronik
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Calculating Machines
Data Source
National Museum of American History, Kenneth E. Behring Center


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