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The bomb consists of a cylindrical steel body with a dished steel nose plate having a central spigot welded on, a steel ring welded to the nose plate, and a wooden nose covered by a thin metal cap and secured by screws to the ring. A tail plate is welded, near the other end of the body and a steel central tube, projecting through the tail plate, is welded to the tail plate and the spigot on the nose plate. On impact, the striker moves forward, bending the arms of the brass cross, and fires the detonator. The flash from the detonator passes through the paper disk covering the hole in the cellophane washer and ignites the primings in the central tube. The primings ignite the thermite and this heats the interior of the bomb raising the internal pressure. When the internal pressure is approximately the methane and petrol solution is expelled and ignited.
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