(Fig. 30)

This bomb differs from that described and illustrated in Pamphlet No. 1, Sec. 18, by the inclusion of a small H.E. unit in place of the screwed plug at the tail end of the bomb body.

Fig. 30

The H.E. unit consits of a 7.23 gms. bursting charge of P.E.T.N./wax (89.3 per cent. penthrite, 10.7 per cent. wax) in a container of thin sheet aluminium closed at one end. The other end is closed by the aluminium detonator sheath, which is pressed into the ex-plosive charge and secured by turning over the rim of the aluminium container. The deto-nating composition is a mixture of lead azide and lead styphnate (0.47 gms) in an alumi-nium cup pressed into the mouth of the tubular portion of the detonator sheath. Below this, in the bottom part of the detonator sheath is an intermediary of lightly consildated P.E.T.N. The complete unit is assembled with a cardboard collar and packing discs in a steel capsule approximately 1 inch in diameter, 1.3 inches long and 0.08 inch thick. The steel capsule is screwed into a cup-shaped steel adapter which in turn is screwed into the tail end of the bomb body under the cone of the tail unit.

The detonation of the bursting charge is initiated, through the medium of the detonator and P.E.T.N. intermediary, by the burning of the bomb. The time between ignition and detonation is between 1 and 1.5 minutes, by which time the bomb is well alight. The magnesium casing is for the most part fragmented and scattered in a fan-shaped area towards the nose of the bomb over a distance of about 15 feet with occasional projec-tions up to 30 feet. The dispersed fragments are small and burn for only a short time. The nose plug of the bomb is not projected and generally continues to burn, whereas the tail unit, if still in position, would probably be projected rearwards and might produce fragments of a dangerous character.

Blind bombs of this type have been discovered with the letter "A" stencilled in red on the base. This probably an indentification marking.