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The fuse assembly consists of a rim fire cap secured to a length of safety fuse, which should give a delay of approximately five seconds. The: can chamber is passed over the safety fuse on to the sleeve of the rim fire cap. A length of copper tube is positioned over the fuse and secured by crimping. The igniter unit consists of igniter composition housed in a tin cup. On top of the igniter composition is a primed cambric disc and a paper sleeve,
To assemble the whole ignition system, the fuse assembly is inserted through the bakelite adapter and the Tree end of the fuse tube is secured to the paper sleeve in the igniter unit. The cap chamber of the ignition system is secured in position by screwing the cup securing cap chamber onto the adapter. The adapter with complete ignition system is screwed on to the neck of the bomb body, the igniter unit positioning itself in the paper cup in the body. The safety cover is screwed down to the rubber washer, housed in the adapter recess, thus forming a seal. A patch of adhesive tape is affixed to the adapter and safety cover. This prevents removal of the safety cover during-transit.
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