Use: Smoke projectiles for the 50 mm grenade discharger and illuminating projectiles for the 70-mm Mortar and the 70-mm howitzer.

Over-all length: 1 3/4 inches.

Maximum diameter: 1 7/16 inches.

Threaded length: 1/4 inch.

Number of threads: 4, left-hand.

Construction: The fuze is made of brass, consisting of the main body and a nose cap fitted together by L.H. threads. There are two brass time rings, one being fixed and the other movable. The primer is located in the lower part of the fuze and is separated from the striker by a spring. The striker is also supported by a safety wire which passes through the nose of the fuze.

Operation: The safety wire holding the striker is removed before the projectile is fired. On set-back the striker moves down against the spring to hit the primer. The flash from this ignites the powder train, which burns through the two time rings into the magazine at the base of the fuze.

Remarks: This fuze has a time setting of 0 to 20 seconds in increments of 1/2 second.

Figure 329 – Type 89 Small Time Fuze.