This breech-loading arm has a fixed chamber closed by a movable breech-block, which rotates about a horizontal axis at 90 degrees to the axis of the barrel, lying below the axis of the barrel and in front, being moved from above by a thumb piece. The arm is opened and cocked by drawing back a locking-piece, hinged to the hammer, and pressed against the frame by a spring lying between it and the hammer. It is closed and fired by drawing the trigger, the mainspring being placed beneath the barrel. The piece is locked by the engaging of the locking-piece, with a corresponding abutment on the frame, into which it is pressed by the locking piece spring, just before the cartridge is struck by the hammer when the piece is fired.
Extraction is accomplished by a hooked-lever pivoted on the hammer, and moving bodily with it in the first instant of opening, and ejection is effected by striking the lower end of another similar lever pivoted to the side of the frame, by the end of the locking-piece, when the opening is nearly completed. A flap hinged to the top of the barrel may be interposed between the head of the cartridge and the hammer, so that the piece may be carried safely when loaded; the upper portion of this flap is formed into a sight base.
Farrow, Edward S. American Small Arms; a Veritable Encyclopedia of Knowledge for Sportsmen and Military Men. New York: Bradford, 1904. Print.
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