This is a direct action fuze of the detonating type in which the striker is held off the de-tonator by a spiral spring. For safety in transport and in the bore a safety device in in-cluded which consists of segments positioned under the striker holder to prevent its mo-vement towards the detonator.

The steel striker, attached to the aluminium striker head by means of the steel holder, is supported in the brass body by means of a steel spiral spring. The spring is held in com-pression between the brass guide ring and a collar formed on the striker head.

The brass base of the fuze screws into the body and carrie a brass cylindrical ferrule supported on a cupro nickel stirrup spring. The ferrule locates four brass segments bet-ween the striker holder and the base and has an internal groove to engage the arms of the stirrup spring when in the armed position.

Details of the initiator fillings and the filling of the brass magazine are not available.

On acceleration the ferrule sets back and is retained in this position by the arms of the stirrup spring engaging the groove in the ferrule. The striker head also sets back, causing the segments to be held by the striker holder. When acceleration ceases, centrifugal force set up by the rotation of the projectile causes the segments to move outward and leave the striker held off the detonator by the spiral spring. On impact the striker head is driven in, compressing the spring and the striker pierces the detonator.

Fig. 26