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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".
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 ...
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.
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 ...
Polaris Fashion Place is a two level shopping mall and surrounding retail plaza serving Columbus, Ohio, United States.The mall, owned locally by Washington Prime Group, is located off Interstate 71 on Polaris Parkway in Delaware County just to the north of the boundary between Delaware and Franklin County.
A former FBI informant pleaded guilty Monday to providing false information to federal authorities about Joe Biden and his son Hunter Biden months before the 2020 presidential election.. Alexander ...
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$5.50 off each 24-pack of 16.9-ounce bottles. If you're tackling Dry January, San Pellegrino sparkling mineral water is a great way to mix things up.The 24-pack of 16.9-ounce bottles is $5.50 off ...
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