Use: Antiaircraft ammunition for type 14-year 105-mm A.A. gun and type 99 88-mm A.A. gun.

Description:

Over-all length: 4 7/8 inches.

Maximum diameter: 2 3/8 inches.

Threaded length: 9/16 inch.

Number of threads: No data.

Construction: This is a 50-second combination mechnical time and impact projectile fuze. The clockwork mechanism is essentially the same as that found in the Navy type 91 fuze. The aluminum alloy windshield adds form to the fuze and houses the upper end of the setback hammer. The time-setting ring, assembly ring, and lower fuze body are made of an aluminum alloy. The clockwork mechanism is housed in the time-setting ring and assembly ring. The time firing assembly consists of a primer cap under which is a black-powder flash channel leading to a small black-powder magazine in the base plug. The impact firing assembly consists of a stationary firing pin separated from a movable carrier by a spring. Two spring-loaded detents are engaged in the slot of the primer car-rier until the projectile is rotating in flight.

Operation:

Time: See Navy type 91.

Impact: Centrifugal force moves the detents from the slot in the primer carrier and the primer carrier is then free to overcome the spring and hit the fixed firing pin upon impact. A small black powder charge flashes to the base magazine which in turn fires the auxiliary detonating fuze. The Army auxiliary detonation fuze is used in conjunc-tion with the type 100.

Figure 334 – Type 100 Mechanical Time and Impact Fuze.