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THOMAS GUN
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; as it descends it retracts the firing-pin by the action of the hammer-stop lever on the projecting head of the retractor, the notched body of which engages with a notch on the firing-pin, and it also presses down one end of the friction lever, the other end of which locks the sear and keeps the hammer from falling until the breech is closed. It is closed by reversing the movement of the block. The mechanism is such that the block is well secured against the effect of any accidental discharge in closing, and is afterward more completely locked by the descent of the hammer beneath the breech-block when the piece is fired. Extraction and ejection are essentially the same as in the Remington rifle.
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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