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Antique measuring instruments/6351-Otis King Calculator
Antique measuring instruments/6351-Otis King Calculator
Antique measuring instruments/6351-Otis King Calculator
Antique measuring instruments/6351-Otis King Calculator
Antique measuring instruments/6351-Otis King Calculator
Antique measuring instruments/6351-Otis King Calculator
Antique measuring instruments/6351-Otis King Calculator
Antique measuring instruments/6351-Otis King Calculator
Antique measuring instruments/6351-Otis King Calculator
Antique measuring instruments/6351-Otis King Calculator
Antique measuring instruments/6351-Otis King Calculator
Antique measuring instruments/6351-Otis King Calculator
Antique measuring instruments/6351-Otis King Calculator
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Antique measuring instruments/6351-Otis King Calculator
Antique measuring instruments/6351-Otis King Calculator
Antique measuring instruments/6351-Otis King Calculator
Antique measuring instruments/6351-Otis King Calculator
Antique measuring instruments/6351-Otis King Calculator
Antique measuring instruments/6351-Otis King Calculator
Antique measuring instruments/6351-Otis King Calculator
Antique measuring instruments/6351-Otis King Calculator
Antique measuring instruments/6351-Otis King Calculator
Antique measuring instruments/6351-Otis King Calculator
Antique measuring instruments/6351-Otis King Calculator
Antique measuring instruments/6351-Otis King Calculator
Antique measuring instruments/6351-Otis King Calculator
Antique measuring instruments/6351-Otis King Calculator
Antique measuring instruments/6351-Otis King Calculator
Antique measuring instruments/6351-Otis King Calculator
Antique measuring instruments/6351-Otis King Calculator
Antique measuring instruments/6351-Otis King Calculator
Antique measuring instruments/6351-Otis King Calculator
Antique measuring instruments/6351-Otis King Calculator
Antique measuring instruments/6351-Otis King Calculator
Antique measuring instruments/6351-Otis King Calculator
Antique measuring instruments/6351-Otis King Calculator
Antique measuring instruments/6351-Otis King Calculator
Antique measuring instruments/6351-Otis King Calculator
Antique measuring instruments/6351-Otis King Calculator
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EUR 400.00
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1561365855Code 6351 Otis King CalculatorCylindrical slide rule of the Otis King's Pocket Calcultor Patent N. 183723 Scale 414-423 from the 1930s, made of chromed brass, placed in its original cardboard box, complete with instructions. Measurements maximum length 26 cm - 10.23 inches, minimum 15 cm - 5.9 inches, diameter 3 cm - 1.18 inches.

In 1630 an English mathematician, the reverend William Oughtred (1574-1600), made the first slide rule on sliding scales. The effectiveness of the slide rule as a tool to quickly perform multiplications and divisions, but also squares, roots and many other operations through the sum or the difference on logarithmic scales, was appreciated only from the end of the 18th century. Special versions were prepared for particular activities, for example to measure timber, iron bars, barrels, head of cattle, to calculate taxes on wines and spirits. Rules for chemical equivalences were also built, to calculate rents, barometric heights, and photographic exposure time.

Otis Carter Formby King (1876–1944) was a grocer and engineer in London who invented and produced a cylindrical slide rule with helical scales. The product was named Otis King's Patent Calculator, and was manufactured and sold by Carbic Ltd. in London from about 1922 to about 1972.

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Code 6351 Otis King Calculator

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