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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 ...
Savings interest rates today: Money can't buy love, but sweet returns of up to 4.50% APY comes close — Feb. 14, 2025
Half.com was founded in 1999 by American entrepreneur Josh Kopelman and Sunny Balijepalli. As an advertising gimmick, in December of the same year, the company paid the town of Halfway, Oregon US$100,000 and donated 20 new computers to change its name to "Half.com, Oregon" for a year.
Bargain Hunt, [4] [5] formerly Essex Bargain Hunt, is an American discount store chain. Founded in 2004, Bargain Hunt is headquartered in La Vergne, Tennessee [ 6 ] with retail locations in Tennessee, [ 7 ] [ 8 ] Ohio , [ 9 ] Indiana , Kentucky , [ 10 ] North Carolina , [ 11 ] South Carolina , Georgia , Alabama , Mississippi and Arkansas .
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 ...
Binoculars: Bushnell sells a wide variety of binoculars and was awarded the Best Buy award from Outdoor Life magazine in 2005 for their Browning Sports Optics binoculars and in 2006 for their Legend binoculars. [22] [23] Microscopes; Telescopes: Bushnell made smaller amateur optical telescopes. Some popular models include the "ARES 5", and the ...
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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