438 LEWIS'S AMERICAN SPORTSMAN. 



SIGHT-PLATE. See TOP-PIECE. 



SPRING-CRAMP. An instrument for taking out the mainspring. 



STOCK. The wood portion of the piece. 



STRIKER. See COCK. 



SWIVEL. See CHAIN. 



TOP-PIECE, SIGHT-PLATE, OR UPPER RIB. The elevated metal plate along which 



the eye is directed to the sight. 

 TRIGGERS. Light pieces of metal protected by the guard, extending to tho 



interior of the lock, and which, upon being pressed by the forefinger, with- 

 draw the scear from the tumbler, and thus permit; the cock to fall and 



explode the cap. 



TRIGGER-PLATE. The plate in which the trigger works. 

 TRIGGER-SPRING. The small spring that, pressing against the trigger, keeps 



it close to the scear. 

 TUBE. See NIPPLE. 

 TUMBLER. The movable centre-piece of a lock, having an axle passing through 



the lock-plate to which the cock is fastened. 

 TUMBLER-SCREW OR PIN. The screw with which the cock or hammer is fastened 



to the tumbler. 

 UNDER CROSS-PIN. The screw which passes through the front of the guard 



or trigger-plate into the base of the break-off. 

 UNDER RIB. The plate of metal running the whole length of the barrels, 



which, together with the upper rib or sight-plate, holds them securely 



together. 



UPPER RIB. See TOP-PIECE. 

 VENT, OR VENT-HOLE. A small hole at the side of the breeching, intended to 



allow the escape of a portion of the explosive force and lessen the recoil. 

 WORM. See RAMROD-SCREW. 



