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Stereoscopic rangefinder atop the bridge of the German cruiser Admiral Graf Spee Portable stereoscopic rangefinder with binoculars from WWII. 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.
Vector series laser rangefinder 7×42 binoculars can measure distance and angles and also features a 360° digital compass and class 1 eye safe filters German U.D.F. 7×50 blc U-boat binoculars (1939–1945) [82] Binoculars have a long history of military use.
A tower viewer [citation needed] is a telescope or pair of binoculars permanently mounted on a stalk. The device magnifies objects seen through its lenses, allowing users to see farther and more clearly than they could with the naked eye or with less powerful viewing devices.
The Fry 8-inch-aperture refracting telescope, manufactured by Thomas Cooke in the 1860s, at the University of London Observatory.. In 1837 Cooke leased a shop at 50 Stonegate, York, with his wife running the shop and Cooke's workshop occupying the rear where he made and repaired whatever instruments were needed.
Pelorus aboard HMS Belfast. In marine navigation, a pelorus is a reference tool for maintaining bearing of a vessel at sea. It is a "simplified compass" without a directive element, suitably mounted and provided with vanes to permit observation of relative bearings.
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