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2. Rangefinder - Wikipedia

   en.wikipedia.org/wiki/Rangefinder

   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. It ...

3. Alexander Selligue - Wikipedia

   en.wikipedia.org/wiki/Alexander_Selligue

   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. History of the oil shale industry - Wikipedia

   en.wikipedia.org/wiki/History_of_the_oil_shale...

   The shale oil production started in 1838 by using Selligue process, invented by Alexander Selligue. [17] [24] In 1846 the Canadian physician and geologist Abraham Gesner invented a process for retorting an illuminating liquid from coal, bitumen and oil shale.

5. Talk:Rangefinder - Wikipedia

   en.wikipedia.org/wiki/Talk:Rangefinder

   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 ...

6. Stereoscopic rangefinder - Wikipedia

   en.wikipedia.org/wiki/Stereoscopic_rangefinder

   A stereoscopic rangefinder or stereoscopic telemeter [1] is an optical device that measures distance from the observer to a target, using the observer's capability of binocular vision. It looks similar to a coincidence rangefinder , which uses different principles and has only one eyepiece.

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