Adding machine
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An adding machine is a class of mechanical calculator, usually specialized for bookkeeping calculations. Consequently, the earliest adding machines were often designed to read in particular currencies
A Remington Rand adding machine alongside its original cardboard box
An older adding machine. Its mechanism is similar to a car odometer.
Corona Portable adding machine exhibited in Moscow
Sundstrand adding machine at Civilian Conservation Corps Museum, Connecticut
Mechanical calculator
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A mechanical calculator, or calculating machine, is a mechanical device used to perform the basic operations of arithmetic automatically, or a simulation like an analog computer or a slide rule. Most
Adding machine
…An adding machine is a class of mechanical calculator, usually specialized for bookkeeping calculations. Consequently, the earliest adding machines were often designed to read in particular currencies…
Four of Pascal's calculators and one machine built by Lépine in 1725, Musée des Arts et Métiers
Replica of Schickard´s calculator
Detail of a replica of an 18th-century calculating machine, designed and built by German Johann-Helfrich Müller.
A mechanical calculator from Anton Braun, dated 1727