percussor

— The shaft on which the percussor is fastened is so adjusted that the spring, while expending its force, throws the hammer a little beyond the line of centre, so that the blow is struck lightly and quickly, and the hammer rebounds very much as it strikes and rebounds from the string of a piano when a note is struck on the keyboard.

— When he has reached this stage, the percussor is an expert, and his ability to produce deceptive effects is his best guarantee that he will not be himself deceived.

— Bi-polar percussion involves the placement of the objective piece on an anvil stone and subsequently striking it with a percussor, as one would crack a nut.

— In a charge torpedo, a spring-pressed percussor recessed at one end, a guide tube in which said percussor works, a plummet adapted to lie in said recess and be held therein by the guide tube, a trigger adapted to engage said percussor and hold the same against the action of its spring, a pull cord secured to said plummet for shifting said percussor in the guide tube against the action of its spring, into position to be engaged by said trigger, ...