A breech-loading small-arm possessing 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 by half—or full—cocking the hammer, and then swinging down the breech-block by depressing the thumb-piece on the right side of the frame. This pushes back the firing-pin and the locking-brace, by the cam acting on the firing-pin retractor and locking-brace retractor respectively. It is closed by raising the thumb-piece, so as to swing the breech-block up into place. In so doing, the locking-brace is thrown forward by its spring into place under the breech-block, as soon as the latter is closed.
The piece is locked by the position of the locking-brace, the lower end of which abuts upon the guard, and is fired by a center-lock of the usual pattern. Both extraction and ejection are accomplished by a revolving extractor, pivoted near the breech-block pin, and struck by the block in its descent. In opening the block the locking-brace is forced against the trigger, and is held there by the block; the hammer, therefore, cannot be made to fall while the piece is opened.
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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