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described above. The first type (I.B.E.N.—Figures 12A and 12B) has a 3½ oz. charge and a total weight of 2.2 kg. which will cause the bomb to penetrate further into buildings than the ordinary type. The overall length without tail is 1 ft. 5 in. A stiff wire 13 in. long with metal disc about 1½ in. diameter at the upper end is passed through the ring at the end of the tail vanes down the side of the bomb and through a hole in a safety pin, projecting from the fuze body. On release from the aircraft air pressure withdraws the wire, which falls separately and may be found on the ground some distance from the bomb. The safety pin is then ejected by an internal spring leaving the striker free. On impact the fuze functions igniting the incendiary body immediately and lighting a slow match fuze in the nose, extending the delay before the detonation of the explosive charge up to a maximum of seven minutes. The explosive extension may also break off on impact and detonate separately, some distance from the incendiary body (Figure 12B).

The second type (I.B.S.E.N.-Figure 13) is known to the Germans as the B 2 E.Z. The charge in the nose is reduced to 2 oz. and the total weight to 2 kg., but a small separating charge is fitted to fling the steel nose and incendiary body some yards apart. The normal I kg. portion is slightly shorter than the standard type, but the tail unit is longer, being 9¾ in., and has only three main fins. The cylinder,