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Though Alexander Selligue is often mistakenly credited with the invention, he did invent an improved rangefinder with fixed lenses in 1821 and is responsible for coining the term. [ 3 ] [ 4 ] In 1881, the British Royal Artillery adopted the depression range finder , which had been developed by Captain H.S.S. Watkin for use by coastal artillery .
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Alexander François Selligue (1784-1845) was a French engineer. His name was in fact Alexandre François Gilles, but he used Selligue as an anagram of Gilles. In 1832, he together with David Blum patented an application of shale oil for direct illumination. In 1838, he patented "the employment of mineral oils for lighting".
4 Telemeter and rangefinder (again) 3 comments. 5 Telemeter as remote measuring instrument. 12 comments. 6 Selligue coined the term. 1 comment. 7 Ngram Analysis. 1 ...
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Eyepiece image of a naval rangefinder, showing the displaced image when not yet adjusted for range. The coincidence rangefinder uses a single eyepiece. Light from the target enters the rangefinder through two windows located at either end of the instrument. At either side the incident beam is reflected to the center of the optical bar by a ...
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