Per-cus′sion-fuse.
(Ordnance.) A fuse in a projectile set in action by concussion when the projectile strikes the object. In the example, A represents a shell. A plunger h held by a spring i and detent o, which engages in a notch at its rear end, is released by withdrawal of the detent occasioned by the shock of impact, and strikes a nipple g on which is a percussion-cap.