Mechanical calculators made for office use that did arithmetic by gears, pinwheels or keys. The arithmometer was the first digital mechanical calculator strong and reliable enough to be used daily in an office, the comptometer was the first commercially successful key-driven calculator, the Odhner Arithmometer was a very successful pinwheel calculator, and the Curta was a hand-held calculator. The Curta was designed by Curt Herzstark, and the Odhner Arithmometer was invented in Russia in 1873 by W. T. Odhner, a Swedish immigrant.
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Wikipedia: Arithmometer
Wikimedia FoundationHas Member: Arithmometer, LeadQuote, Has Member: Arithmometer, Lead
The arithmometer (French: arithmomètre) was the first digital mechanical calculator strong and reliable enough to be used daily in an office environment.
Wikipedia: Comptometer
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The comptometer was the first commercially successful key-driven mechanical calculator, patented in the United States by Dorr Felt in 1887.
Wikipedia: Odhner Arithmometer
Has Member: Odhner Arithmometer, LeadQuote, Has Member: Odhner Arithmometer, Lead
The Odhner Arithmometer was a very successful pinwheel calculator invented in Russia in 1873 by W. T. Odhner, a Swedish immigrant.
Wikipedia: Curta
Wikimedia FoundationHas Member: Curta, LeadQuote, Has Member: Curta, Lead
The Curta is a hand-held mechanical calculator designed by Curt Herzstark.
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