Remington Rand Univac Minimum Latency Calculator Slide Rule

This circular device was an aid to programming the UNIVAC solid state computer. It consists of a paper disc, with equal divisions running from 1 to 200 near the edge, and a clear plastic rotating disc. These are pivoted together at the center. The upper disc is marked in red with two perpendicular diameters. The lower disc is marked: MINIMUM LATENCY CALCULATOR FOR THE UNIVAC SOLID-STATE COMPUTER. The UNIVAC had a magnetic storage drum on which locations were specified numerically. The latency calculator allowed programmers to write code for the machine to make the most efficient possible use of the drum memory.
The back of the instrument gives a list of instruction codes and corresponding execution times for words. It is marked: Remington Rand Univac. It is also marked: U1767 Rev. 1 PRINTED (/) IN (/) U.S.A. The rule was received in a paper bag.
Reference: Sperry Rand Corporation, Simple Transition to Electronic Processing, UNIVAC Solid-State 80, (1960), 18–26.
Currently not on view
Object Name
calculating rule
slide rule
date made
after 1950
Remington Rand Univac
Physical Description
paper (overall material)
plastic (part material)
metal (part material)
overall: .1 cm x 14 cm x 14 cm; 1/32 in x 5 1/2 in x 5 1/2 in
place made
United States: New York, New York
ID Number
accession number
catalog number
Rule, Calculating
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Computers & Business Machines
Slide Rules
Data Source
National Museum of American History, Kenneth E. Behring Center


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