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Japanese Bomb, 70 kg Incendiary, Type 1 No. 7 Mk 6 Model 3 Mod 1

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1397-081

Description

Gray overall with a 3 1/2 inch red band at the nose and red tail struts. New type markings will be found.

A cast steel nose piece is attached to a longitudinally welded steel body by a continuous circumferential weld. The nose contains a wooden block 1 3/4 inches thick to which a light metal gaine well is secured by three nails. A longitudinally welded tail cone is welded to a collar which fits into the after end of the body and is held there by a single row of 16 screws.

Four steel fins are spot welded to the tail cone. They are braced by a single set of box-type struts.

Type 1 No. 7 Mk 6 Model 3: This bomb uses the same case as that described above but differs in the filling. It contains a high explosive burster charge in a central tube and an explosive filling of approximately 520 wedge shaped rubber pellets impregnated with iron and aluminum.

Hazardous Components

182 cylindrical incendiary pellets are arranged around a central cardboard tube. The pellets are bound together with string to form rings. The rings surround the central tube which is filled with gray powder. All the space in the bomb not occupied by the pellets is filled with this powder.

Composition of pellets - Barium nitrate 35%, ferric oxide 28%, aluminum 18%. Remainder is synthetic rubber of polysulphide type resembling "thiokol".

Each pellet weighs 7 oz., 196 g. Total incendiary pellet weight is 81 lbs,  36.8 kg.

Igniter powder - 30 lbs, 13.6 kg.

Composition of igniter powder - Barium nitrate 75%, aluminum 24.5%, oil 0.3%, moisture 0.2%.

See Also

General Information, Japanese Navy Bombs

Source(s)

TM 9-1985-4, Japanese Explosive Ordnance (Bombs, Bomb Fuzes, Land Mines, Grenades, Firing Devices and Sabotage Devices) (1953)

OP 1667, Japanese Explosive Ordnance, Volume 1 (1946)