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Krupp K5
The Krupp 28-cm-Kanone 5 (E), in short K5 with the (E) signifying ''Eisenbahnlafette'' (railway car gun-mount), was a heavy railway gun used by Germany throughout World War II.
==Description==
Krupp's K5 series were consistent in mounting a long gun barrel in a fixed mounting with only vertical elevation of the weapon. This gondola was then mounted on a pair of 12-wheel bogies designed to be operated on commercial and military rails built to German standards. This mounting permitted only two degrees of horizontal traverse. The carriage had to be aligned on the rails first, with only minimal fine leveling capable once halted. Hence the gun could only fire at targets tangential to an existing railway track.
To track targets needing greater traverse either a curved length of railway was used with the gun shunted backwards or forwards to aim; a cross-track was laid with the front bogie turned perpendicular to the rest of the gun and moved up and down the cross-track to train the weapon; or for 360 degree traverse, the so-called "Vögele Turntable" could be constructed, consisting of a raised rail section (the "firing bed") carrying the gun, running on a circular track with a central jack to raise the gun during traverse and to take some of the enormous weight.
The main barrel of the K5 is in calibre (caliber), and is rifled with twelve grooves. These were originally deep, but were shallowed to rectify cracking problems.
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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