DIAMETER

HEIGHT

WEIGHT

EXPLOSIVE WEIGHT

EXPLOSIVE

MATERIAL

COLOR

FUZE

switch;

b) Pressure switch, E.P.

No. 1

USE:

This mine is bounding shrapnel mine designed for anti-personnel purposes. When the mine is fired, the bomb jumps from its container, comes to rest on the surface of the ground and explodes.

COMPONENTS:

The E.P. No. 4 Mine consists of three components parts: the outer mine canister, the inner loaded mine case, and the special Fuze Unit No. 1.

(a) Outer Canister: The outer canister consists of a cylindrical sheet metal container for the inner loaded case. The outer canister acts as a sort of mortar from which the inner case is projected. A short tube projects from one side of the outer container near the bottom. The instantaneous fuze passes through this tube to the switch when the mine is laid. The top of the outer canister is closed by a lid.

(b) Inner Case: The inner loaded mine case contains shrapnel set in concrete around the sides and bottom. In the center of the case are located the three sticks of Gelig-nite witch comprise the main explosive charge. Near one edge of the inner case is loca-ted a hole to allow passage of the instantaneous fuse.

(c) Fuze Unit No. 1: The fuze unit consists of a length of RED Instantaneous Fuse. Toward the center of this length of fuse is fixed  a charge of black powder, which ser-ves to propol the bomb from the container. A No. 27 detonator is crimped to one end of the length of fuse. A one inch length of safety fuse intervenes between the detonator and the instantaneous fuse is led through the tube in the base of the outer canister to be initiating switch. The fuze unit is shipped in the bomb, but not assembled.

ASSEMBLY & ARMING:

Remove the lid from the mine, and withdraw the fuze unit and the inner case. Thread the detonator end of the fuze unit through the hole in the inner case. Thread the other end through the hole in the outer canister and draw it all the way through, lowering the inner case gently into the canister. Attach the trip or pressure mechanism to the fuze unit. Charge the bomb with three sticks of Gelignite; insert the detonator into one stick; and replace the lid of the mine.

NEUTRALIZATION:

Cut the red fuse at the most convenient place. Neutralize the switch. Remove the lid from the outer canister and pull the detonator from the charge. Remove the inner case from the container and unthread the fuze unit.

REMARKS:

1. Although any British switch may be used with this mine, the switch designed espacially for it is the Pressure Switch, E.P. No. 1. The switch consists merely of two steel plates hinged together. The upper plate carries a pressure bar, which, when the plates are forced together, crushes a chemical igniter ampoule which is contained in a tube on the lower plate. The end of this tube is open and is of suitable diameter to accept RED Instantaneous Fuse. The fuse is inserted as fas as possible, then crimped in place.