antik.it/Antique-measuring-instruments/8478-Pocket-Calculator/
Code 8478
EUR 350.00
In stock
1774609258Code 8478 Pocket CalculatorOtis King's Pocket Calculator Patent No. 183723 Model K 1192, Scale 414-423, 1930s, chrome-plated brass, complete with original cardboard case.
Dimensions: Maximum length 26 cm – 10.3 in, minimum 15 cm – 5.9 in, diameter 3 cm – 1.2 in.
Otis Carter Formby King (1876–1944) was a London grocer and engineer who invented and manufactured a cylindrical slide rule with a helical scale. The product was called Otis King's Patent Calculator and was manufactured and sold by Carbic Ltd. in London from about 1922 to about 1972.
In 1630, an English mathematician, the Reverend William Oughtred (1574-1600), manufactured the first slide rule with sliding scales. The effectiveness of the slide rule as a tool for quickly performing multiplication and division, as well as squares, roots, and many other operations by adding or subtracting on logarithmic scales, was only appreciated by the late 18th century. Special versions were developed for specific tasks, such as measuring lumber, iron bars, barrels, and livestock, and calculating taxes on wine and spirits. Slide rules were also constructed for chemical equivalences, rent calculations, barometric pressures, and photographic exposure times.
FAQ
Do you provide an authenticity certificate/expertise?
Of course! The legislative decree n. 42/2004 stipulates that who sells works of art or historical and archaeological items has the obligation to deliver to the purchaser the documents attesting to the authenticity of the object, or at least to submit the documents relating to the probable attribution and origin. Antik Arte & Scienza provides an expertise (as warranty) that contains a description, period and assignment or the author, if known, of the item.
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Shipping by DHL or UPS is free (but if we are shipping to a country non-EU remember that any taxes and customs duties are on your expense), and items will be sent just after receiving of payment.
Italy: delivering on the average in 24 h.
Europe: delivering on the average in 2/3 weekdays.
Other countries: delivering on the average in 5 weekdays; custom duties charged to the buyer.
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Of course! Free insurance by Lloyd's London that covers almost all destinations.
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Antique measuring instruments
Code 8478 Pocket Calculator
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