WebFor more than a century, periscopes have been sub commanders' window to the outside world, allowing them to check their surroundings, find targets, and assess their attacks. WebApr 5, 2024 · A periscope is an instrument for observation around or through an object in presence of an obstacle or condition that prevents generally the direct line-of-sight …
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WebApr 17, 2015 · The periscope is an instrument for observation over, around or through the object, obstacle or condition that prevents direct line-of … WebFeb 18, 2016 · Periscope only holds copies of videos for 24 hours, so if you're not joining in and viewing the scopes you might never see them again. For many users, this is part of … changeable hitch ball
Scientific American January 1915 World War 1 Airships Submarines Periscopes
Periscopes, in some cases fixed to rifles, served in World War I (1914–1918) to enable soldiers to see over the tops of trenches, thus avoiding exposure to enemy fire (especially from snipers). The periscope rifle also saw use during the war – this was an infantry rifle sighted by means of a periscope, so the shooter … See more A periscope is an instrument for observation over, around or through an object, obstacle or condition that prevents direct line-of-sight observation from an observer's current position. In its simplest form, … See more Johannes Hevelius described an early periscope (which he called a "polemoscope") with lenses in 1647 in his work See more Periscopes allow a submarine, when submerged at a relatively shallow depth, to search visually for nearby targets and threats on the surface of the water and in the air. When not in use, a submarine's periscope retracts into the hull. A submarine … See more Tanks and armoured vehicles use periscopes: they enable drivers, tank commanders, and other vehicle occupants to inspect their … See more • Coincidence rangefinder • Relay lens • Rangefinder See more • The Fleet Type Submarine Online: Submarine Periscope Manual United States Navy Navpers 16165, June 1979 • Simulation of a Periscope at NTNUJAVA Virtual Physics Laboratory See more WebBasically: An attack periscope has a low profile and is used (usually) for an attack where you are trying to remain undetected. A search periscope is bigger and has a larger profile. It will have a larger window so has a larger elevation and depression. Most navies the tubes are the same, as is the ocular box and torque motors. WebApr 13, 2024 · An overwhelming majority of U.S. adults (88%) say either that marijuana should be legal for medical and recreational use (59%) or that it should be legal for medical use only (30%). One-in-ten say the drug should not be legal in any form. These views have held steady since April 2024. Public support for marijuana legalization differs widely by ... changeable heels shoes