Mainframe Computer Component, X Adder from the SWAC


The SWAC (Standards Western Automatic Computer) was an early stored program electronic computer built by the U.S National Bureau of Standards at the Institute for Numerical Analysis at the University of California Los Angeles. Construction began in 1948, it was dedicated in mid-1950, and it remained in use at UCLA after the INA closed in 1954, finally being turned off in the mid-1960s.

This x adder component from the machine has a sturdy metal frame, five vacuum tubes, and an array of other components. A tag on one end reads: Technitrol (/) Technitrol Engineering Co. (/) PHILADELPHIA, PA, USA. (/) MOD. 124 SER. 35.


P.A. Kidwell, "Promoting Computing in the Postwar United States - The Case of UCLA," IEEE Annals of the History of Computing, vol. 45 #1, April-June 2023, pp. 43-52.

Date Made: 1950

Maker: National Bureau of Standards

Location: Currently not on view

Place Made: United States: California, Los Angeles

See more items in: Medicine and Science: Computers


Exhibition Location:

Credit Line: National Bureau of Standards

Data Source: National Museum of American History

Id Number: 1983.0208.06Catalog Number: 1983.0208.06Accession Number: 1983.0208

Object Name: mainframe component

Physical Description: metal (overall material)plastic (overall material)Measurements: overall: 83 cm x 23 cm x 5 cm; 32 11/16 in x 9 1/16 in x 1 15/16 in


Record Id: nmah_1367809

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