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A pinwheel calculator is a class of mechanical calculator described as early as 1685, and popular in the 19th and 20th century, calculating via wheels whose number of teeth were adjustable. 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 ...
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9500 - The 9500 is a black 3.2 oz desktop calculator that uses LR1130 batteries. It has a selectable rounding switch and selectable decimal switch. This calculator also includes 3-key independent memory and is made with 50% recycled plastic. [19] 9700 - The 9700 is a black 9.6 oz desktop calculator with a 12 digit tilted LCD display. It has ...
A mechanical calculator, or calculating machine, is a mechanical device used to perform the basic operations of arithmetic automatically, or (historically) a simulation such as an analog computer or a slide rule.
Slide the slide until the number on the D scale which is against 1 on the C cursor is the same as the number on the B cursor which is against the base number on the A scale. (Examples: A 8, B 2, C 1, D 2; A 27, B 3, C 1, D 3.)
Stepped Reckoner, 1672 – Gottfried Wilhelm Leibniz's mechanical calculator that could add, subtract, multiply, and divide. Difference Engine, 1822 – Charles Babbage's mechanical device to calculate polynomials. Analytical Engine, 1837 – A later Charles Babbage device that could be said to encapsulate most of the elements of modern computers.
Brunsviga 15 Mechanical Calculator Original Odhner-Arithmos-Typ-5. Brunsviga is a calculating machine company whose history goes back to 1892 with devices upgrading from mechanical to electrical thereafter. The firm Grimme & Natalis that manufactured the machines changed their name to Brunsviga Maschinenwerke A.G. in 1927.
Mechanical calculator companies (1 C, 14 P) E. Electromechanical calculators (1 C) F. Flight computers (2 P) Pages in category "Mechanical calculators"
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