Pinwheel calculator

A Pinwheel calculator was a class of mechanical calculator popular in the 19th and 20th century using, for its calculating engine, a set of wheels that had an adjustable number of teeth. These wheels, also called pinwheels, could be set by using a side lever which could expose anywhere from 0 to 9 teeth, and therefore when coupled to a counter they could, at each rotation, add a number from 0 to 9 to the result. By linking these wheels with carry mechanisms a new kind of calculator engine was invented. Turn the wheels one way and one performs an addition, the other way a subtraction. As part of a redesign of the arithmometer, they reduced by an order of magnitude the cost and the size of a mechanical calculators on which one could easily do the four basic operations (add, subtract, multipl

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Pinwheel calculator

A Pinwheel calculator was a class of mechanical calculator popular in the 19th and 20th century using, for its calculating engine, a set of wheels that had an adjustable number of teeth. These wheels, also called pinwheels, could be set by using a side lever which could expose anywhere from 0 to 9 teeth, and therefore when coupled to a counter they could, at each rotation, add a number from 0 to 9 to the result. By linking these wheels with carry mechanisms a new kind of calculator engine was invented. Turn the wheels one way and one performs an addition, the other way a subtraction. As part of a redesign of the arithmometer, they reduced by an order of magnitude the cost and the size of a mechanical calculators on which one could easily do the four basic operations (add, subtract, multipl

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A Pinwheel calculator was a cl ...... ss of the Odhner Arithmometer.

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Ein Sprossenrad ist ein Zahnra ...... ach Willgodt Theophil Odhner).

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Las calculadoras de ruedas de ...... estar, multiplicar y dividir).

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Une roue à nombre variable de ...... ortent par un système de came.

@fr

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734.909.130

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A Pinwheel calculator was a cl ...... ations (add, subtract, multipl

@en

Ein Sprossenrad ist ein Zahnra ...... ach Willgodt Theophil Odhner).

@de

Las calculadoras de ruedas de ...... estar, multiplicar y dividir).

@es

Une roue à nombre variable de ...... s l'autre sens elle retranche.

@fr

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Calculadora de rueda de pines

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Pinwheel calculator

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Roue à nombre variable de dents

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Sprossenrad

@de