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T.I. 250-lb. Sea Marker, No. 19 Mks I and II (Service) |
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Filler and Weight | ||
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| NA, | |||
| Body and Overall Weight | |||
| NA, 180 lb. (approx.) | |||
| Color | |||
| Black; red fining band 8 in. from the nose | |||
| Type of Round, DODIC | |||
| T.I.,Sea Marker, NA |
| Description: |
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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 canister 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 canister is divided in two by a thin dished plate, The upper part of the canister forms a buoyancy chamber, while the lower part is filled with a sodium phosphate-phosphorus mixture. The lower part of the canister is pierced by several water-inlet holes, which are covered by wire netting. Six wooden battens extend along the outside of the canister to force off the tail plate. |
| Use: |
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| The body, tail plate, and buster container of the Bombs No. 18 Mk I and Mk II are the same as those of the corresponding marks of the T.I. Bombs No. 1. |
| Functioning: |
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| When the fuze functions, the flash from its magazine ignites the buster charge, which forces the ejector plate aft. shearing its securing screws and ejecting the canister. When the canister falls into the sea, the buoyancy chamber keeps it afloat while water enters the inlet hole and reacts with the chemi¬cal filling to produce impure phosphate gas. This gas escapes through the water-inlet holes and ignites spontaneously on contact with air to give a luminous /lame about three feet long, as well as a cloud of dense white smoke. |
| Munition Components: |
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| Data Source: |
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| OP 1665 Explosive Ordnance British |
| Munitions Tech Data Sheet: |
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