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Lotfernrohr 7
The Carl Zeiss ''Lotfernrohr'' 7, or ''Lotfe'' 7, was the primary series of bombsights used in most Luftwaffe level bombers, similar to the United States' Norden bombsight, but much simpler to operate and maintain. Several models were produced and eventually completely replaced the simpler ''Lotfernrohr'' 3 and BZG 2 bombsights. The Lotfe 7C, appearing in January 1941, was the first one to have gyroscopic stabilization.
==Design==
A member of the German Duquesne Spy Ring, Herman W. Lang, who had been employed by the Carl L. Norden Corporation, (manufacturers of the Norden bombsight) was able to provide vital details of the new bombsight to the Germans. During a visit to Germany in 1938, Lang reconstructed plans from memory.
The Norden consisted of two primary parts, the optical system, and a large stabilization platform. Both were complex and had to be separately maintained to keep them operational.
In comparison the Lotfe 7 was dramatically simpler, consisting of a single metal box containing the vast majority of the mechanism, with a tube (''Rohr'') extending out the bottom with a mirror that reflected the image of the target into a small telescope in the box. The mechanisms within combined the functions of the Norden's stabilizer and optics, moving the mirror to stabilize the image as well as tracking the target. The controls were likewise much simpler than the Nordens', consisting primarily of three large knurled knobs to adjust aim.
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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