Contact Board Associated with Herman Hollerith

This wooden board has six switches on it, and six metal nubs. The nubs and one end of each switch are screwed into the board. On the opposite side are contacts for electrical wires. Twelve nails in the board on top assure that one switch can only meet one nub. Holes at opposite ends of the board allow it to be attached to a table, with a groove in the back for wires.
Compare to switches on the Hollerith tabulating system with museum number MA*317982.05.
Currently not on view
Object Name
contact board
date made
ca 1900
Hollerith, Herman
Physical Description
rubber (overall material)
wood (overall material)
brass (overall material)
overall: 3.8 cm x 8.3 cm x 6 cm; 1 1/2 in x 3 9/32 in x 2 3/8 in
ID Number
accession number
catalog number
See more items in
Medicine and Science: Mathematics
Tabulating Equipment
Computers & Business Machines
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
Gift of the Estate of Herman Hollerith, Jr.
Additional Media

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