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Smoke 4-lb. Mks I, II, and IV (Service) |
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Filler and Weight | ||
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| NA, | |||
| Body and Overall Weight | |||
| NA, 3 lb. 14 oz. | |||
| Color | |||
| Dark green red band around nose | |||
| Type of Round, DODIC | |||
| Smoke, Mk I, NA |
| Description: |
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| The bomb consists of a cylindrical metal body closed at both ends and containing a smoke composition. At the tail end of the bomb is a baffle plate secured to the body and provided with a smoke emission hole cov¬ered by a strip of primed fabric held in place by two strips of adhesive tape, Beneath the baffle plate is un igniter pellet secured to a strawboard washer. The hole in the washer is filled with match composition which contacts the igniter pellet. The igniter pellet is set in the smoke composition, Above the baffle plate is a lid secured to the bomb body and provided with a screw-threaded fuse adapter. The Fuze No. 859 Mk I is screwed and cemented into the fuze adapter. |
| Use: |
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| There are at present in service use only four smoke bombs, exclusive of those bombs containing smoke spotting charges. These are the 4-, 1O0-, 120-, and 500-lb. smoke bombs. The bombs are used to lay smoke screens to conceal troop movements. |
| Functioning: |
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| When the bomb is released from the Small Bomb Container, the .safety cap of the fuze is drawn off by the action of air resistance on the fabric drogue. The lead sleeve on the webbing tape attached to the safety pin causes the free end of the tape to clear the waisted portion of the fuze body and be caught in the air stream, thus withdrawing the safety pin. The fuse is now armed, with the lead ball and striker held away from the detonator by the creep spring alone, On impact with the target, the fuze; functions. The flash from the detonator passes through the dash hole in the fuse body and fires the primed cambric strip, which in turn ignites the match composition. The match composition fires the igniter pellet, and this ignites the smoke composition. The smoke generated passes through the smoke-emission hole in the baffle plate and builds up pressure beneath the lid, thus burst-ins the adhesive tape covering the small smoke-emission hole in the lid and permitting the smoke to escape into the air. After a short period of time the heat evolved in the bomb melts the solder securing the lid to the bomb body, and the pressure of the smoke then forces off the lid. |
| 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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