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UPDEGRAFF RIFLE
This breech-loading small-arm has a fixed chamber closed by a movable breechblock, 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. By bringing the hammer to the full cock, a link connecting its under surface with that of the breech-block throws the latter down into the position of loading. The hammer when released moves forward to the half-cock notch, and changes its point of bearing on the block to the other side of the center of motion, by engaging with a second link like that above mentioned. As the breech-block opens the firing-pin is withdrawn. The piece is closed by again bringing the hammer to the full-cock, the action of the link being reversed from the change of its bearing on the block. This can also be done by hand in the usual way. The piece is locked by the descent of the hammer beneath the block when the piece is fired. Extraction is accomplished by a disk pivoted on a hub formed on the side of the breech-block, and provided with the necessary radial arms. This disk is recessed for the head of the firing-pin retractor. Ejection is secured by accelerating the movement of the extractor, by a quick blow which it receives from the nearest link, at its release in the act of opening the piece.
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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