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| BRITISH EXPLOSIVE ORDNANCE |
| Part 1 - Chapter 18 |
| Target Identification Bombs |
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T.I. 250-lb., Multi-Flash, No. 7 Mks I and II, and No. 21 Mks I, II, III, and IC (Service) |
| Data |
| Fuzing | Nose Fuze No. 860 Mk II, No. 848, or No. 896 Mk I |
| Color markings | The bomb is painted black over-all with a ½-in. red filling band located 8 in. from the nose. MULTI-FLASH RED is stencilled in red letters on the nose, and in white letters on the body. |
| Tail No. | No. 1 Mk II, No. 35 Mk I, or No. 75 Mk II |
| Over-all length | 67.75 in. |
| Body diameter | 12 in. |
| Tail length | 27.2 in. |
| Tail width | 11.7 in. |
| Total weight | 220 lb. (approx.) |
| Burning time | 0.1 sec. (individual unit) |
| 5 min. (total contents of bomb) |
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Body Construction: |
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No. 7 Mks I and II and No. 21 Mks I and II Bodies – The actual construction of these bombs is the same as that of the No. 1 T.I. Bomb Mk I except for a different arrange-ment of the filling, which requires a different type of central flash tube and priming, and eliminates the use of the division disc. |
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The flash units are packed around the central tube in seven layers, each of which contains 26 units; and an eight layer, containing 28 units, is positioned above the central tube. The flash units are positioned to that the primed ends of each two layers contact one of the four primed cambric washers for purpose of ignition. Each of these washers engages a strip of primed cambric, which is secured around a set of holes in the central tube. |
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The Bomb No. 7 Mk II differs from the No. 7 Mk I as the No. 1 Mk II differs from the No. 1 Mk I. |
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No. 21 Mk III and IC Body – The Body, tail-plate, burster container, and ejector plate of this bomb are the same as in the T.I. Bomb No. 1 Mk I. The interior arrangement of the Bomb No. 21 Mk III differs from the No. 7 and No. 21 Mks I and II is that the central flash tube extends completely through the bomb to the tail fuze pocket, thus displacing two of the flash units. The Bomb No. 21 Mk IC differs from the No. 21 Mk III as the No. 1 Mk IC differs from the No. 1 Mk III. |
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Functioning |
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No. 7 Mks I and II, and No. 21 Mks I and II – The explosion of the fuze magazine igni-tes the burster charge, which transmits its flash to ignite the primed cambric tube, the primed strips around the central tube, the primed washers, and the flash units. The ejec-tion of the flash units is the same as for the Bomb No. 1 Mk I. |
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No. 21 Mk III and IC Bombs: The operation of these bombs, when nose-fuzed, is the same as that for the Mks I and II of the T.I. Bombs No. 7 and No. 21. When tail-fuzed, the flash is transmitted from the tail fuze to the nose burster by the primed cambric tube which meanwhile ignites the units. Ejection is the same as for the Bomb No. 1 Mk III. |
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Tail Construction: Same as for the No. 1 T.I. bomb tails. |
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Suspension: The bomb is suspended by a single lug, which is welded to the body. |
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Filling: No. 7 Mks I and II and No. 21 Mks I and II, 210 red flash units; No. 21 Mks III and IC, 208 red flash units. |
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Remarks: This bomb is used to distinguish a genuine ground marker from one silmula-ted by the enemy. |
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Figure 76 – T.I. 250-lb., Multi-Flash, Bomb No. 7 Mk I |
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