Fig. 2

This is an extra sensitive fuze with an explosive safety device, armed centrifugally. It is used in shell for 2 cm aircraft and A.A. guns.

It consistsof a fuze body of brass on which is screwed a nose retained by a screw. The body is prepared to take a percussion detonator.

A striker kept in a safe position by a centrifugal bolt which fits under a flange below the head of the striker;

Fig. 2

a safety arrangement consisting of a catch supported on a pellet of compressed gun-powder. The catch is held with its top rounded bearing surface against the inclined plane of the centrifugal bolt and thus prevents this from moving outwards.

The powder pellet is connected, through two cylindrical horizontal passages, to two vertical recesses, one of which contains a primer supported over a needle by a spring the other identical but empty in the fuze examined.

Action. – On firing the primer sets back on the needle and is ignited. The flash passes through the horizontal passage and ignites the powder pellet. When the pellet is fuzed it frees the catch and thus allows the centrifugal bolt to fly outwards. The striker is then free but creep action due to deceleration in flight and the protection of the cover plate keeps it from the detonator until it is driven in on impact.