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ROBERTS GUN
This rifle, resembling the Martini-Henry in some respects, 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 above the axis of the barrel and in rear, being moved from above. The piece is opened by raising a hooked catch-lever, at the end of the tang of the breech-block, out of its notch in the tang of the receiver. This depresses the forward end of the block so as to expose the chamber. The reaction of the breech-block spring lying underneath the block throws up the front of the block sufficiently to keep the cartridge from falling out of the chamber before the breech is fully closed. The closing is done by returning the lever to its place, or automatically by cocking the piece. The back of the hammer in the latter case presses against the end of the slot in the tang of the breech-block in which it plays, and so raises the front of the block into place. The piece is locked by the position of the breech-block, which is also kept in place by the engaging of the hook of the catch-lever with a corresponding notch in the tang of the receiver. Extraction and ejection are accompanied by a bent lever pivoted to the side of the receiver below the chamber, and struck by the breech-block face in its descent.
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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