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| BRITISH EXPLOSIVE ORDNANCE |
| Part 1 - Chapter 18 |
| Target Identification Bombs |
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T.I. 250-lb., Photoflash, No. 11 Mk I, No. 12 Mk I, and No. 13 Mks I and II (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. A colored band on the nose indiactes the color of the candles in the bomb, while the color is also sten-cilled in the appropiate shade on the body. PHOTOFLASH is sten-cilled in white letters on the nose. |
| 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 | 210 lb. (approx.) |
| Flash illumination period | 0.1 sec. |
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Body Construction: The Bombs No. 13 Mk I and Mk II have bodies, base plate, and burster containers identical to those of the corresponding marks of the T.I. Bombs No. 1. |
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The ejector plate is perforated and has a wooden block attached to it by scews. This block houses the photoflash igniter. The photoflash unit has a thin metal body, and a central burster tube filled with black powder. |
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The candles are arranged in two layer around the central flash unit. A primed cambric washer is located between the primed ends of the two layers. |
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Functioning: When the fuze functions, it ignites the burster charge, whose flash ini-tiates both the photoflash igniter and the primed cambric disc, which ignites the candles. The expanding gases of the burster eject the flare contents. The candle function in their normal manner, and the photflash unit exploder with a vivid, white flash about two se-conds after ejection. |
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Tail Construction: Same as for the No. 1 Mk I 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: The filling of the Bomb No. 13 consists of a photoflash unit, and 40 Type A candles. |
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Remarks: Both the 250 lb. T.I. Bombs No. 11 and No. 12 were manufactured in limi-ted numbers, and have been superseded by the Bomb No. 13. Both bombs were similar to the No. 13, but the No. 12 was filled with 40 Type B1 candles packed around the photo-flash unit, while the No. 11 contained no candles, the space being packed with sand to act as ballast. |
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Figure 78 – T.I. 250-lb., Photoflash, Bomb No. 13 Mk I |
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