Bombs used in

Fuzes used with

Over-all length

Over-all length of vanes

Width of fuze body

The upper portion of the fuze is a cylindrical tube holding a sleeve, the lower part of which is threaded to receive an arming spindle. The vanes are secured to the domed cap screwed atop the sleeve. The L-shaped safety bolt engaged by a spindle-loaded detent prevents the rotation of the vanes. The arming screw spindle has a tubular base where the steel balls hold a spring-loaded striker. An angular groove is cut into the body just above the detonator. The booster screws onto the fuze base.

When the bomb is released, the L-shaped safety bolt is withdrawn. The vanes rotate, turning the sleeve, which causes the arming spindle to move downwards until the steel balls are freed into the angular groove the body. The striker then moves forward because of its spring and fires the detonator. The fuze requires 3 to 4 seconds to arm and func-tion after release from the plane.

Figure 275
Mechanical Time Fuze – Model 1930