Matches in DBpedia 2016-04 for { <http://wikidata.dbpedia.org/resource/Q2518040> ?p ?o }
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- Q2518040 abstract "A disappearing gun, a gun mounted on a disappearing carriage, is an obsolete type of artillery which enabled a gun to hide from direct fire and observation. The overwhelming majority of carriage designs enabled the gun to rotate backwards and down behind a parapet, or into a pit protected by a wall after it was fired; a small number were simply barbette mounts on a retractable platform. Either way, retraction lowered the gun from view and direct fire by the enemy while it was being reloaded. It also made reloading easier, since it lowered the breech to a level just above the loading platform, and shells could be rolled right up to the open breech for loading and ramming.Some disappearing carriages were complicated mechanisms, protection from aircraft observation and attack was difficult, and almost all restricted the elevation of the gun. With a few exceptions, construction of new disappearing gun installations ceased by 1918. The last new disappearing gun installation was a solo 16-inch gun M1919 at Fort Michie on Great Gull Island, New York, completed in 1923. In the U.S., due to lack of funding for sufficient replacements, the disappearing gun remained the most numerous type of coast defense weapon until replaced by improved weapons in World War II.Although some early designs were intended as field siege guns, over time the design became associated with fixed fortifications, most of which were coastal artillery. A surprising late exception was the use in mountain fortifications in Switzerland, where six 120mm guns on rail-mounted Saint Chamond disappearing carriages remained at Fort de Dailly until replaced in 1940.The disappearing gun was usually moved down behind the parapet or into its protective housing by the force of its own recoil, which (on many models) lifted a counterweight. Before firing, the crew tripped a catch on the counterweight, causing it to fall and move the gun back up "into battery" (firing position).Some disappearing guns also used compressed air, while a few were built to be raised by steam.".
- Q2518040 thumbnail British_64_Pounder_Rifled_Muzzle-Loaded_(RML)_Gun_on_Moncrieff_disappearing_mount,_at_Scaur_Hill_Fort,_Bermuda.jpg?width=300.
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