The encyclopædia britannica; a dictionary of arts, sciences, literature and general information . Fig. 38.—Welin Breech Screw. arranged on the same principle but in this case usually forms partof the box slide, that portion of the mechanism attached byinterrupted collars to the rear end of the vent axial, in which thefiring lock slides as it is actuated by the opening or closing of thebreech mechanism. When the breech is being opened the firing pinof the lock is drawn back to safety and the lock is moved aside fromover the tube; a tripper then actuates the extractor and ejects thefired tu
The encyclopædia britannica; a dictionary of arts, sciences, literature and general information . Fig. 38.—Welin Breech Screw. arranged on the same principle but in this case usually forms partof the box slide, that portion of the mechanism attached byinterrupted collars to the rear end of the vent axial, in which thefiring lock slides as it is actuated by the opening or closing of thebreech mechanism. When the breech is being opened the firing pinof the lock is drawn back to safety and the lock is moved aside fromover the tube; a tripper then actuates the extractor and ejects thefired tube. The extractor and tripper are so contrived that when anew tube is pushed home the extractor is also pushed back into theclosed position, or, if the tube is somewhat stiff to insert, the actionof closing the mechanism moves the lock over the primer and forcesit home. The firing lock used in guns is an important part of the. Fig. 39.—Elswick Coned Screw. mechanism. They are all designed on the same principle, witha view to safety and rapidity, and may be regarded as a miniaturesliding breech mechanism. In the older types the lock or its sub-stitute was manipulated by hand, and with electric firing the wiresfrom the tubes were joined up to the loose ends of the firing circuit; 204. ORDNANCE [HISTORY AND CONSTRUCTION
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Keywords: ., bookcentury1900, bookdecade1910, bookidencyclopdiab, bookyear1910
