Description: The body is turned out of a solid 1 1/2-inch, cast-iron bar. It houses a spring-loaded striker which is held in position by a safety pin and a release pin. The safe-ty pin fits through the aft end of the striker projection out of the upper part of the body. The release pin extends through the body and the shoulder of the striker. The explosive train consists of a 6.5-mm cartridge case into which is wedged a blasting cap with the open end facing the cartridge cap. The cartridge case is wedged into the base of the firing device.

Employment: The threaded base fits the fuze cavity of a 20-pound British bomb. This device is very easily adapted for booby traps.

Operation: Device screwed into bomb, pull wire attached to release pin, and safety pin removed. Pull on the wire removes release pin which frees the striker.

To render safe: If the release pin is still in position with a trip wire attached, insert a pin through the safety pin hole, cut the trip wire and unscrew the device from the bomb.

Figure 190 – Booby-Trap Firing Device.