Smoke 120-lb. Mb I and II (Service)
No Image Available Filler and Weight
NA,
Body and Overall Weight
NA, 31 in.
Color
Dark green with red band around lower part of body
Type of Round, DODIC
Smoke, NA
Description:
The bomb consists of a cylindrical body to which the tail unit is secured. The body houses a metal container filled with a smoke composition, and a gunpowder ejection charge contained in nine celluloid capsules. The bomb body is steel tube welded to a flattened nosepiece. The nose-piece is centrally tapped to receive the fuse, and, during transit and storage, is sealed by a nose transit plug and leather wisher. A suspension lug is welded to the exterior of the bomb body. A steel flash plate, abutting the nose-piece within the bomb body, has a steel collar secured to it. A small centrally-located hole is drilled through the :lash plate, and is sealed by a paper disc. The nine celluloid capsules, each filled with 1 oz. 1 drm. of gunpowder, are retained in the collar by a cardboard sleeve, and felt a ad cardboard washers. The sleeve has six equi-spaced holes near its inner end. The metal container, Ailed with approximately 50 lb. of smoke composition (H.C.E.), is housed in the bomb body against the flash plate It has a 3-in, diameter hole sealed with a celluloid disc. Between this disc and the smoke composition there are four strawboard washers, each with a 1 ½ diameter hole; the hole so formed being sealed by two squares of primed fabric, The container is retained in position against the flash plate by a closing plate fitted into the rear end of the bomb body, and secured by four turned-over metal tabs.
Use:
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:
On impact of the bomb with the target, the magazine of the fuze explodes after a delay of not less than ½ sec, during which period the bomb will have come to rest. The flash from the fuze magazine, passing through the hole in the flash plate and the celluloid disc, ignites the two primed cambric squares, which in turn ignite the smoke composition in the container. Concurrently with the ignition of the smoke composition, the flash from the fuze magazine also passes through the holes in the cardboard sleeve to initiate the gunpowder ejection charge contained in the nine celluloid capsules. The resulting explosion of the gunpowder ejects the tail, the closing plate, the container of burning smoke composition, and the flash plate, clear of the crater formed by the bomb,
Munition Components:
  • Nose Fuze No. 864 Mk I
  • Fuzingose Fuze No. 864 Mk I
  • Fuzing Nose Fuze No. 864 Mk I
Data Source:
OP 1665 Explosive Ordnance British
Munitions Tech Data Sheet:
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