n. One who or that which interrupts. Also interruptor.n. Specifically— In electricity, any instrument for interrupting an electrical current, as the automatic arrangement used with the induction-coil.n. In milit. engin., an electrical device which forms part of a system of apparatus for determining the velocity of projectiles, used in connection with wire targets and chronographs. The passage of the ball or shell through a target serves to interrupt a closed electrical circuit, and thus release the automatic registering mechanism of the chronograph at the instant of passage. Often a number of targets are used, placed at accurately measured and uniform intervals in the path of the projectile, and the registered data serve as a basis for determining the variation of velocity in different parts of the path.n.