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adding machine |
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adding machine) An adding machine from the 1940s. Simple adding machines that printed on paper tape were introduced around 1872. The early models were hand-driven, and operated by a crank that printed the number on the tape and added the number to the running total. Some later models replaced the cranks with electric motors.
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? Mentioned in | ? References in periodicals archive | |
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CPAs constantly enter numbers on a keyboard or an adding machine, which
increases the risk of developing a repetitive stress injury (PSI). Other new technologies, however, soon
followed: "The cash register was patented in 1879, dictating
machines and stereotypes in the 1880s, the mimeograph machine in 1890,
the Hollerith machine which was used to tabulate the 1890 census, a
full-listing adding machine . For a project on dinosaurs,
students created a time line using 2,000 feet of adding machine tape,
with every seven inches covering 5 million years. |
adding machine
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