488 lewis's amekican sportsman. 



Sight-plate. — See Top-piece. 



Spring-cramp. — An instrument for taking out the mainspring. 



Stock. — The wood portion of th« piece. 



Striker. — See Cock. 



SwivKL. — 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 the 



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. 



V 



