REPEATING CROSSBOW

 

 

Repeating Crossbow is a crossbow where the separate actions of stringing the bow, placing the bolt and shooting it can be accomplished with a simple one-handed movement while keeping the crossbow stationary. This allows a higher rate of fire than a normal crossbow: there is a magazine containing a number of bolts on top of the bow, and the mechanism is worked by moving a rectangular lever forward and backward.

Know more:
http://en.wikipedia.org/wiki/Repeating_crossbow