This a 1 kg H.E., streamlined mortar bomb of the anti-personnel type with a vaned tail unit which carries the cartridge. The bomb is fitted with a quick acting nose fuze which carries a gaine.

The body is of mild steel with walls 4 mm thick and has a  cylindrical portion near the head. This cylindrical portion has a diameter of 5 cm (1.96 in.) and has three annular grooves formed in it. A screwthreaded fuze hole is formed at the head and the base end is similary prepared to receive the cartridge container portion of the tail unit. The body contains a bursting charge of T.N.T. which has an approximate weight of 127 grammes (4.5 oz.) and is designed to provide a cavity for the inner end of the fuze with its gaine.

The tail unit consists of a cylindrical cartridge container to which eight vanes, formed in pairs, are spot welded. The container is of mild steel and is closed at the front end where a screwthreaded spigot is formed for attachment to the body. Six perforations are provided near the front end of the container for the escape of pressure and a fixing screw is fitted near the base for the purpose of securing the cartridge.

The body and main part of the fuze are of aluminium with the exeption of the detonator pellet which is of steel and the retaining spring and cover disc which are of brass. The mechanism consists of a striker secured to a cup-shaped movalble pellet in the head of the fuze and located in a guide in the form to the movable detonator pellet with a weak spring interposed between its forward end and the striker pellet which is the means of keeping the striker and detonator apart when the fuze is armed. For safety in transport and storage, nine steel balls are located between the striker pellet and the detonator pellet by means of an arming sleeve supported by an arming spring. This device prevents the detonator being prematurely fired by contact with the striker as the result of shocks and jars which might otherwise overcomes the weak spring of the striker. The arming sleeve has a flange formed around the rear end to engage with the tongues of the re-taining spring – fitted in the detonator pellet – when the fuze is armed.

On acceleration the arming sleeve sets back, compressing its spring and engaging with the tongues of the retaining spring which prevent it rising again. The striker is prevented from setting back and piercing the detonator by the steel balls. During flight the steel balls move forward into the striker pellet the available space in which has been increased by the setting back of the arming sleeve. The striker and detonator are then held apart only be the striker spring. The striker pellet is protected from air pressure by the brass closing disc in the head of the fuze. On graze or impact the striker spring is compressed and the striker fires the detonator. The flash from the detonator passes to the initiator filling in the head of the gaine which brings about the detonation of the gaine filling and thus detonates the bursting charge of the bomb.

Fig. 2