EMPLOYMENT: Base fuze for 15-cm Granate 39 anticoncrete shell. (See fig. 611.)

DATA:

FUZE:

Over-all length: 3.0 inches.

Maximum diameter: 2.0 inches.

Threaded length: 1.0 inch.

Number of threads: 12 RH.

BOOSTER HOLDER:

Over-all length: 6.125 inches.

Maximum diameter: 3.0 inches.

Threaded length: 1.062 inches.

Number of threads: 8 RH.

CONSTRUCTION: This steel fuze threads into a large steel booster adapter. A notched setting disk which gives choice of two delays or instantaneous action is seated in the fuze head and held in the fuze by a locking ring on which are marked the setting indicati-ons G.V. (long delay), K.V. (short delay), O.V. (without delay). A second notch on the underside of the setting disk engages a ridged portion of the aluminum striker holder. This holder, to the bottom of which is affixed a feld disk, rides easily on an aluminum foil-co-vered steel plate towards the base of the fuze. Three holes drilled in this plate give ac-cess of three holes in an aluminum disk below it. Two of these contain black powder de-lay while the third is empty. Thus, the turning of the holder which has a single flash hole, determines delay. A powder tray with one hole giving access to the gaine screws into the fuze base.

The firing mechanism is standard and simple. The detonator in a brass holder is held from the fixed firing pin by means of five centrifugal detents in a spring ring.

ACTION: Rotation of the projectile causes the centrifugal detents to swing out against the spring, arming the fuze. On impact, the detonator impinges on the striker and flashes through a flash hole beside the striker, to the aluminum disk containing the delays.

Figure 611 – Bd.Z. (15-cm Gr. 19 Be.)