Punch Card Probe

This cylindrical metal stainless steel rod is about 8" long and resembles a crochet hook. The metal is serrated along the middle part of the rod. One end is hooked, the other is flattened and U-shaped. The donor worked with tabulating machines and then computer equipment from the 1940s into at least the 1960s.
Reportedly the hook was used to line up punched cards and the flattened end to complete holes that had not punched properly.
Currently not on view
Object Name
punch card probe
date made
ca 1950
Physical Description
stainless steel (overall material)
overall: .2 cm x 20.3 cm x .2 cm; 3/32 in x 8 in x 3/32 in
ID Number
nonaccession number
catalog number
Computers & Business Machines
Tabulating Equipment
See more items in
Medicine and Science: Mathematics
Tabulating Equipment
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
Gift of Benjamin S. Mulitz

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