IBM Machine Load Computer Slide Rule

This plastic rectangular instrument calculated the time required for different types of IBM punched card equipment to process given numbers of cards. The black side is for accounting machines, sorters, and collators. The white side is for card punches, verifiers, and auxiliary machines. These machines were in use from roughly 1953 through 1959. The white side is marked: IBM; International Business Machines Corp. (/) 590 Madison Ave. New York 22, N.Y. (/) Patent Applied For. It is also marked THINK and MADE IN U.S.A. An instruction card is provided. A tan envelope is marked: IBM (/) MACHINE LOAD COMPUTER (/) AND DESCRIPTIVE FOLDER (/) Form 20-8704-1. No patent record was located.
Benjamin S. Mulitz, the donor, worked with punched card equipment and then with computers from 1940 until 1985. He used both Remington Rand and IBM products. He was employed by the U.S. government and then in the wholesale drug industry.
Reference: accession file.
Currently not on view
Object Name
calculating rule
date made
International Business Machines Corporation
Physical Description
plastic (overall material)
paper (case material)
overall: .2 cm x 25 cm x 10 cm; 1/16 in x 9 13/16 in x 3 15/16 in
place made
United States: New York, New York
ID Number
accession number
catalog number
Science & Mathematics
Rule, Calculating
Computers & Business Machines
Slide Rules
See more items in
Medicine and Science: Mathematics
Slide Rules
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
Gift of Benjamin S. Mulitz
Additional Media

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