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Upon release from the plane, the cluster breaks apart and the safety plunger that had been imprisoned by intimate contact with the bomb next to it, is now free and is partially ejected by its spring from the fuze housing. The striker is now free, but is restrained from striking the primer by a restraining spring. At the same time, the gauze streamer is forced out by air pressure and serves to stabilize the bomb in flight. On impact, the force of inertia causes the striker to move against its spring bringing the firing pin into the primer. The flame from the primer ignites a black powder spitter fuze, which in turn sets off a black powder booster charge. The booster charge functions a charge of black powder and magnesium mixture that ruptures the bomb case, spreads the filler, and ignites it.
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