The encyclopædia britannica; a dictionary of arts, sciences, literature and general information . Fig. 33.—Krupp Breech Action. ratchet lever E. This was worked and so disengaged the breechscrew from the threads cut in the gun; the cam lever was thenfolded down as to to start the breech screw, and the winch handle Qrotated and so withdrew the screw and swung it clear of the breechopening. During these operations the firing lock was actuated andmade safe, but the fired tube had to be extracted by hand. To closethe gun these various operations must be reversed, and to open or closethe gun would
The encyclopædia britannica; a dictionary of arts, sciences, literature and general information . Fig. 33.—Krupp Breech Action. ratchet lever E. This was worked and so disengaged the breechscrew from the threads cut in the gun; the cam lever was thenfolded down as to to start the breech screw, and the winch handle Qrotated and so withdrew the screw and swung it clear of the breechopening. During these operations the firing lock was actuated andmade safe, but the fired tube had to be extracted by hand. To closethe gun these various operations must be reversed, and to open or closethe gun would certainly occupy at least half a minute with trained compare with this a modern 12-in. breech mechanism is shownin fig. 41. In order to open this breech it is only necessary to turn 202 ORDNANCE [HISTORY AND CONSTRUCTION the handwheel continuously In one direction, and to close it againthe motion of the handwheel is simply reversed; either closing oropening the breech by hand occupies about 6 seconds. Supposingthe breech closed, the handwheel when rotated gives motion to thelink G th
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