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Four holes in the lid of this box accommodate four igniters, and the mine is complete by the addition of a false lid which consists of a movable pressure platform attached to a wooden frame by means of canvas.

When assembled, the framework is secured to the mine body by four clips, and the pres-sure platform rests on top of the four igniters with the canvas fully stretched. The whole mine is painted for camouflage. There is a single, rope, carrying handle.

Two types of igniters have been used in this mine. On consists of a bakelite cone to which a bakelite lid is cemented. A projection below the cone fits into an ordinary deto-nator, and the latter is then pressed on. Within the cone is a small paper cylinder con-taining small pieces of hard limestone mixed with a small quantity of a chlorate flash mix-ture. Pressure on the mine lid, the bakelite cones, and friction between the hard limes-tone and the chlorate mixture, produces a flash which ignites the detonators, initiating the mine. The other igniter is also bakelite, but is of more robust construction.

The base of the body is screw-threaded to take the plug which retains the detonator. The detonator contains a cap, and a thin bakelite washer is inserted above this cap to give clearance for the striker needle and to insure that the detoantor is held securely by the plug.

The striker holder rests on a conical boss within the body of the igniter, and the latter is closed by a push-fit cover. The igniter functions when pressure on the lid of the mine causes the igniter body to break down and force the needle onto the cap. Trials have shown that the mine, when fitted with this igniter, functions under a static load of ap-proximately 300 lb.

Pressure in the lid causes the igniters to function, detonating the main charge.

Figure 241
Four-Igniter Mine - Anti-Tank Mine