(2) There are three types of time fuzes: powder train, mechanical and proximity. Powder train fuzes (fig. 4-22) make use of compressed black powder rings that burn for a predetermined length of time and then initiate the high-explosive element in the fuze. Mechanical time fuzes (fig. P23) incorporate a clocklike mechanism. Through a gear train and escapement, this mechanism trips a firing pin at a predetermined time, causing the fuze to function. Proximity fuzes are discussed in (3), below.

(3) The proximity (VT) fuze (fig. 4-24) is essentially a self-powered radio transmitting and receiving unit. Shortly after the projectile leaves the muzzle of the weapon, the fuze becomes armed and begins sending out radio waves. As the projectile approaches an object, the waves are reflected and picked up by a receiving unit in the fuze. Interaction of the outgoing and incoming waves results in beats. When the beats reach a predetermined intensity, an electronic switch is tripped, thereby closing an electric circuit. An electric charge is permitted to flow through an electric firing squib thus initiating the explosive train. Newer type proximity fuzes are designed for bracket arming for antiaircraft artillery use and adjustable delay arming for field artillery use.

Figure 4-18. Base-detonating fuze. 4-19

a-booster cup b- booster pellet C-body

D-booster lead

E-sl1der assembly

F-slider charge



J-spring k-plunger

L-rotor firing pin m-safety pin n-head

P-tracer ra pd 109523c

Figure 4-18. Base-detonating fuze. 4-19

nose end a—rotor housing b—rotor

C—bleeder resistor d—sequential leaves e—rotor spring f i booster lead cup


G—booster h—contact spring j—wiper contact ra pd 213055

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