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decade length of 66 inches, the Otis King calculator should be about a full digit more accurate than a 6-inch pocket slide rule. But due to inaccuracies in tic-mark placement, some portions of its scales will read off by more than they should. For example, a reading of 4.630 might represent an
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brand cylindrical slide rule sold by Oliver
Garfield Company in New York was initially a relabelled Otis King; Garfield later made his own, probably unauthorized version of the Otis King (around 1959). The UK patents covering the mechanical device(s) would have expired in about 1941–1942 (i.e. 20
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with helical scales, primarily for business uses initially. 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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years after filing of the patent) but copyright in the drawings- which would arguably include the spiral scale layout- would typically only expire 70 years after the author's death.
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answer of 4.632, or almost one part in 2000 error, when it should be accurate to one part in 6000 (66"/6000 = 0.011" estimated interpolation accuracy).
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41:(1876–1944) was an electrical engineer in London who invented and produced a cylindrical
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At age 25, was unmarried, and his occupation was listed as 'Electrical
Engineer'.
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Otis King's patent calculator, model K; Photo by
Richard Lyon.
145:Cylindrical rules at Museum of HP Calculators
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164:Richards, Susan (November 10, 2002).
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18:Otis King's Patent Calculator
175:. International Slide Rule Museum
128:Fuller's cylindrical slide rule
85:US patent US 1,645,009 (1923)
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198:"Flat Otis King's Scale 423"
80:UK patent GB 207,856 (1922)
75:UK patent GB 183,723 (1921)
70:UK patent GB 207,762 (1922)
140:Dick Lyon's Otis King pages
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95:Canadian patent CA 241076
90:Canadian patent CA 241986
110:German patent DE 418814
105:French patent FR576616
100:French patent FR569985
39:Otis Carter Formby King
243:Mechanical calculators
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166:"Finding "Mr. King""
173:sliderulemuseum.com
253:English inventions
123:Bygrave slide rule
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238:English inventors
16:(Redirected from
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258:Analog computers
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27:British inventor
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205:. Retrieved
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177:. Retrieved
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233:1944 deaths
228:1876 births
248:Logarithms
222:Categories
207:2021-01-20
151:References
43:slide rule
50:log-scale
117:See also
65:Patents
48:With a
179:May 5,
58:Geniac
169:(PDF)
181:2021
56:The
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