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| U.S.N.B.D. - BRITISH BOMBS AND FUZES; PYROTECHNICS; DETONATORS |
| AIRCRAFT SMOKE BOMBS |
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BRITISH BOMB |
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FUZING |
Tail Fuze No. 854 Mk I |
100 LB. SMOKE |
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COLOR & MARKINGS |
Dark green overall, with | |
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red band around lower | |
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part of body. | |
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TAIL NO. |
Fabric Tail |
Mks I & II |
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OVERALL LENGTH |
18.3" |
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BODY LENGTH |
18.3" |
(Service) |
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MAX. BODY DIAMETER |
10" square |
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WALL THICKNESS |
Very thin |
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TAIL LENGTH |
21" |
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TAIL WIDTH |
12" |
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TOTAL WEIGHT |
92-95 lbs. | |
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CHARGE/WEIGHT RATIO |
85% (approx.) |
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BODY CONSTRUCTION: |
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These bombs are dropped from aircraft to produce smoke screens to cover land ope-rations. The bomb consists of a thin tin-plate can of square cross-section, on one face of which are soldered two corrugated stiffeners, these serving to increase the strength of the can and also acting as distance pieces between the can and the drop bar of the 250 lb. Small Bomb Container. A burster container, to take the No. 854 Mk I fuze and its burster, and an offset filling hole are provided in the top part of the can, together with a large circular distance piece. |
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The burster container is closed, during transit and storage by a rolled-thread tin-plate transit plug. The filling hole is permanently sealed by a rolled thread filling hole cap, seating on a sealing disc. This cap must in no cirumstances be unscrewed from the bomb, and as it is fitted with a short Tommy bar, it may be readily distingushed from the transit plug. |
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Three handles for lifting the bomb are provided, and at two diagonally opposite cor-ners of the can are soldered metal loops for the attachment, by a length of whipcord, of a fabric tail which acts as a stabilizer to the bomb. |
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FUNCTIONING: |
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On impact of the fuzed bomb with its target, the "all-ways" action fuze functions in-stantaneously, and the explosion of its burster disrupts the bomb and scatters the white phosphorous filling which, on contact with the air, ignites spontaneously and be-gins to give off smoke. |
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SUSPENSION: |
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These bombs are carried three in a 250 lb. Small Bomb Container. In the container, they are separated from each other by the distance piece on the end of each bomb. |
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EXPLOSIVE COMPONENTS: |
Burster: Gunpowder. |
| Main Filling: 86 lbs. white phosphorous. |
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REMARKS: |
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1. The Mk II bomb is similar to the Mk I in operation, differing only in minor structural details as follows: |
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a) The filling hole is centrally located in the top of the can. |
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b) Two small distance pieces are provided at the top of the can and are located at diagonally opposite corners, on either side of the filling hole. |
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c) The two metal lopps to which the fabric tail is secured differ slightly in design to those used on the Mk I bomb. |
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2. These bombs have a burning time of 15-20 minutes and provide an effective screen 250-300 yds. in length. |
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