mechanical calculator
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mechanical machine for arithmetic operations for absolute calculators
~40 min read
Encyclopedic overview
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Various desktop mechanical calculators used in the office from 1851 onwards. Each one has a different user interface. This picture shows clockwise from top left: An Arithmometer, a Comptometer, a Dalton adding machine, a Sundstrand, and an Odhner Arithmometer
Excerpted from Wikipedia’s “mechanical calculator” article, available under the CC BY-SA 4.0 licence.