Projectiles used in

Over-all length

Maximum diameter

Thread diameter

Markings

This time fuze has a maximum time setting of 40 seconds. Its clockwork mechanism is identical to that in British Time Fuze No. 209 execpt for operation. The firing pin and de-tonator are located in a holder which rests in a groove in a cen-trifugal bolt, keep in po-sition by a detent located in one end. At the other end of the bolt is a flash-hole. The detonator holder tends to ride up the inclined plane on the lower centrifugal bolt onto, the firing pin; but this is prevented by the centrifugal bolt's being immovable in an armed position by its detent, a second centrifugal bolt locked in position by a projection from a third centrifugal bolt. This third bolt is locked in position by a spring-loaded fourth centri-fugal bolt, and by the bottom crown wheel. The fuze base is graduated and numbered in a circle from 0 to 7. Inside the cover is an indicator disc, showing the number of comp-lete revolutions as seen through a small window. This disc is graduated 8, 16, 32, and 40 respectively, representing seconds. Inside the cover are four locking needles fitted into recesses and held in position by a stirrup spring. On firing; these needles setback and prevent rotation of the setting mechanism.

On firing, the detent in the first centrifugal bolt sets back and frees the bolt which, how-ever, is unable to move, since the other bolts are locked until the slot in the bottom crown wheels comes into position and the third and fourth bolts are freed to move out-wards under centrifugal force. The projection is then removed from the recess in the se-cond bolt, which is freed to move outwards between the plate holding the firing pin and detonator. This action causes the detonator holder to rise up an inclined plane to hit the firing pin. Simultaneously, flash-holes in the first bolt, detonator holder, and base of the fuze draw into line.

Figure 223
Mechanical Time Nose Fuze M36