DATA:

Over-all length: 3.6 inches.

Diameter: 2.35 inches.

Threaded length: 0.5 inch.

Number of threads: 4 RH.

Employment: 21-cm Wgr. 42 Spr.

DESCRIPTION: This fuze is designed to operate on impact, through a wooden extension rod, or on graze, and has an optional delay of 0.15 second. The fuze consists of a three-section aluminum body containing a striker and spring, five pivoted centrifugal segments retained by an expanding circular spring, a detonator carrier containing the detonator, an inertia collar, a delay mechanism, and a magazine. (See fig. 584.)

In the unarmed position, the striker is separated from the detonator by a light spring and by the five segments. The shutter of the delay mechanism is held over the instantaneous flash channel by pressure of the centrifugal bolt and its spring. The delay chamber is un-covered.

To set the fuze for instantaneous action, the screw driver slot in the setting plug is tur-ned to the O mark stamped on the fuze body, thereby bringing a slotted recess in the plug into alinement with the shutter. When set for delay action, with the slot in the set-ting plug at the M and V marks, the plug prevents movement of the shutter, thus keep-ing the instantaneous flash channel closed.

A wooden actuating rod extends from the forward end of the striker in the nose of the fuze to the inside of the top of the ballistic cap.

OPERATION: During flight the centrifugal segments swing outwards, leaving the detona-tor carrier riding only on the light spring. If set for instantaneous action, the centrifugal bolt in the delay mechanism moves outward, allowing the shutter to slide into the setting plug and open the instantaneous channel. If set for delay action, the plug prevents of the shutter, leaving only the delay channel.

Direct impact will force the striker into the detonator through the medium of the wooden actuating rod. On graze impact, the detonator carrier may ride forward against the stri-ker, or it may be forced against the striker by the camming action of sideways movement of the inertia collar.

The flash from the detonator passes through the delay or instantaneous channel to the black powder pellet in the magazine and initiates the booster in the shell.

Figure 584 – l.Jgr.Z. 23 n.A.