Construction: The forward end of the fuze is externally threaded to fit into the base of the projectile nosepiece. The fixed firing pin threads into the firing pin holder, which threads into the forward end of the fuzy body. The primer carrier, housed in the forward section of the fuze body, is held in the unarmed position by five detents which engage a shoulder on the primer carrier and are sourrounded by a thin, flat spring. The detent holder threads into the fuze body from the after end. A flash channel is cut, longitudi-nally through the primer carrier and detent holder leading to the delay pellet and explosi-ve train. A gaine adapter, threading into the base of the fuze body, contains the delay pellet, secondary primer, and sub-booster. The explosive gaine threads onto the gaine adapter.

Operation: Centrifugal force causes the five detents to open against their spring, much like a camera diaphragm, thus freeing the primer carrier to hit the fixed firing pin on im-pact. The flash from the primer passes through the channel in the primer carrier and de-tent holder to the delay pellet and explosive train.

Remarks: This fuze is installed in the forward end of the projectile at the junction of the nose piece and the projectile body, to that no part of the fuze is visible in the assembled projectile.

Figure 434 – Type 1 Short-Delay Impact Fuze.