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height finder
A height finder is a ground based aircraft altitude measuring device.
Early height finder implementations were optical devices and later migrated to radar devices. Devices combining both optics and radar were deployed by the U.S. Military.〔(【引用サイトリンク】 Anti-Aircraft Fire Control Sets )〕
== Optical ==
In World War II, a height finder was an optical rangefinder used to determine the altitude of an aircraft (actually the slant range from the emplacement which was combined with the angle of sight, in a mechanical computer, to produce altitude), used to direct anti-aircraft guns.〔(The Gunnery Pocket Book, paragraph 428. )〕〔(【引用サイトリンク】 Status Update for the M2 Height Finder Project )〕 Examples of American〔 and Japanese versions exist, in the Soviet Union it was usually combined with optical rangefinders,〔()〕〔()〕 certainly a German version exist.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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