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| U.S.N.B.D. - BRITISH BOMBS AND FUZES; PYROTECHNICS; DETONATORS |
| INCENDIARY BOMBS |
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BRITISH BOMB |
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FUZING |
Mk I - Nose Fuze No. 38 |
30 LB. I.B. |
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Mks II - IV - Nose Fuze | |
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No. 846 | |
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COLOR & MARKINGS |
All Marks dull red overall; | |
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Mk I has one bright red |
Mks IV & IVE |
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band around nose; Mks |
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II - III has two bright red |
(For Mks I, II, IIM, III & IIIM, |
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bands, one around the |
see "Similar Incendiaries" below) |
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nose and one around the |
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rear of body. |
Mks III & IV - Service |
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TAIL NO. |
No. 40 Mk I |
Other Marks - Obsolete |
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OVERALL LENGTH |
32.7" | |
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BODY LENGTH |
18" | |
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MAX. BODY DIAMETER |
5" | |
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WALL THICKNESS |
0.1" | |
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TAIL DIAMETER |
4.7" | |
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TAIL LENGTH |
14.2" | |
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FILLING |
1 lb. white phosphorous, 7 lb. rubber-benzole or Perspex- | |
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benzole solution. | |
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TOTAL WEIGHT |
25 lb. |
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DESCRIPTION: |
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Bomb consists of a cylindrical body with a hemispherical nose at one end and a tail at the other, the cylindrical tail strut being connected by four equispaced fins to the rear end of the tail cone. Cylindrical body is made from welded tube, forward end re-duced slightly to fit in the rim of the hemispherical steel plate nose, to which it is wel-ded. Nose is pierced centrally and has welded into it a burster container closed by a screwed plug, the outer surface of which conforms with the shape of the bomb nose. A flanged tail plate is welded in the rear end of the body and has in the center a hollow spigot through which the bomb is charged. The spigot is closed by a screwed plug, and it is threaded externally for the attachment of the tail. Riveted in the forward end of the tail cone is a diaphragm plate having a threaded boss which screws on to the tail plate spigot to secure the tail to the bomb body. A 10 per cent air space is left in the body when it is filled. A 3" wide cylindrical strut is attached to rear of tail cone by 4 fins spot welded to both and cone. Tail cone closed by end cap. |
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SUSPENSION: |
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Carried in Small Bomb Container, or suspended from bomb carrier by a lug on a sus-pension band. SBC 250 will carry 8 bombs. |
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FUNCTIONING: |
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On impact the firing of the gunpowder in the magazine of the fuze disrupts the bomb body along the weld, and scatters the filling over a considerable area to produce a large number of source of fire. |
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SIMILAR INCENDIARIES: |
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Mk I, 30 lb.: Similar to Mk IV except (a) burster container is screwed and welded into a flat nose plug which is welded in the end of the body, and a hemispherical nose fairing fits on to the nose plug; (b) employs the No. 38, N.D. nose fuze (c) filling con-sists of 1.5 lb. white phosphorous cast in nose of body, and approximately 6 lbs. of 5 percent solution of rubber in benzols. |
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Mk II, 30 lb.: Similar to the Mk IV except (a) the body is made from drawn tube in-stead of being a welded tube, so that the bomb functions by tail ejections of the filling, the tail plate and tail being blown off by the firing of the magazine charge in the fuze; (b) weight of wihte phosphorous cast in nose is 1.5 lbs. |
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Mk III: Similar to Mk IV except body is of heavier gauge metal. |
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Mk IIIM, 30 lb.: Similar to the Mk III except that body has two external pads to lo-cate a suspension band with lug, which may or may not be used. |
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Mk IIM, 30 lb.: Similar to Mk II except that the body has two ex-ternal pads to lo-cate a suspension band with a lug, which may or may not be used. |
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Mk IVM, 30 lb.: Differs from Mk IV only in that it has a suspension band with a lug. |
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