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This bomb utilizes the unloaded metal parts of the Mk II, 17lb Fragmentation Bomb. It is filled with a bag containing black powder. The extrusion, Mk II, instead of being tetryl loaded is loaded with E.C. blank fire powder. Increasing the diameter of the flash hole modifies the Mk XI fuze. The adapter booster casing, Mk I, is modified by removing the booster casing from the adapter booster casing, leaving only the adapter. The explosive of this bomb consists of the mercury fulminate in the detonator, E.C. blank fire powder in the extrusion, and black powder in the bomb body. No booster charge or primers are used in this bomb. The striking of the detonator by the firing pin fires the detonator. Except for the inherent slight delay, the fuze is only capable of functioning instantaneously. The bomb body is cylindrical in shape and is made from rejected 3-inch artillery shell. A limited number of these bombs thus modified and loaded are
available for training.
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