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| BRITISH EXPLOSIVE ORDNANCE |
| Part 1 - Chapter 18 |
| Target Identification Bombs |
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T.I. 250-lb. Sea Marker, No. 19 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 8 in. from the nose. SEA MARKER-FLAME is stencilled on the nose, and SEA MARKER is stencilled on the bomb 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 | 180 lb. (approx.) |
| Burning time | 5 to 8 min. (approx.) |
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Body Construction: The body, tail plate, and burster container of the Bombs No. 19 Mk I and Mk II are the same as those of the corresponding marks of the T.I. Bombs No. 1. |
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The ejector plate is secured by screws to a ring, which is welded to the inner edge of the nose. A cannister of thin steel rests on the ejector plate, and is held in position by a thin diaphragm soldered to the inside of the body just beneath the tail plate. The inside of the cannister is divided in two by a thin dished plate. The upper part of the cannister forms a bouyancy chamber, while the lower part is filled with a sodium phosphide-phos-phorus mixture. The lower part of the cannister is pierced by several water-inlet holes, which are covered by wire netting. Six wooden battens extend along the outside of the cannister to force off the tail plate. |
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Functioning: When the fuze functions, the flash from its magazine ignites the burster charge, which forces the ejector plate aft, shearing its securing screws and ejecting the cannister. |
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When the cannister falls into the sea, the buonyancy chamber keep it afloat while water enters the inlet hole and reacts with the chemical filling to produce impure phos-phine gas. This gas escape through the water-inlet holes and ignites spontaneously on contact with air to give a luminous flame about three feet long, as well as a cloud of dense white smoke. |
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Tail Construction: Same as for the No. 1 T.I. bomb tail. |
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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 bomb is filled with a sodium phosphide-phosphorus mixture. |
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Figure 80 – T.I. 250-lb., Sea Marker, Bomb No. 19 Mk I |
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