The 15 sec. Delay firing device M1 does not use the standard nipple, not is it used with a blasting cap.

GENERAL:

The 15-second delay firing device M1 is used to obatin delay in firing demolition charges, particuarly during assault demolitions. It can be used to fite charges underwa-ter since the case is waterproof.

DESCRIPTION:

This firing device consists of an olive drab plastic case, a pull ring attached to a coated pull wire, flash compound, and a 15-second powder-train delay tube with a de-tonator at the end.

OPERATION:

When the safety pin is removed, a pull on the pull ring draws the coated wire through the flash compound. The resultant flash ignites the powder-train delay which sets off the detonator fifteen seconds later.

REMARKS:

(1) The pull ring should be jerked sharply.

(2) Once the pull ring has been jerked there is no way to stop detonator fuze explo-ding. Once exploded, the fuze cannot be re-used.