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| ITALIAN AND FRENCH EXPLOSIVE ORDNANCE |
| Chapter 9 |
| FRENCH BOMB FUZES |
| Mechanical Impact Nose Fuze - Type A |
| Data |
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Bombs used in |
50-kg, 100-kg, 200-kg, G.P.-H.E. and 125-kg |
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Fuzed used with |
No. 3 bis Tail Fuze |
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Over-all length |
6.9 in. (with booster) |
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Over-all length of vanes |
3.1 in. |
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Width of fuze body |
2.6 in. |
| Description |
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The fuze consists of: (1) An upper brass conical section threaded internally to receive the arming spindle; (2) a truncated, conical section of steel which is externally threaded to screw into the bomb fuze pocket, and internally threaded to receive the upper section of the fuze; and (3) a brass tube containing the detonator. |
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The striker is attached to the arming spindle by a pin. The detonator is housed in a double-walled copper container which is retained in the rear position by a creep spring. |
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Vanes are attached to the upper end of the arming spindle by a brass screw, and are prevented from rotating by a safety pin through a slot in the body and a hole in the spindle. A second safety device consists of a copper wire secured to one vane and caught between the upper brass and steel sections of the fuze body. If the fuze is to be used for long- or short-delay action, one or more delay pellets may be fitted into the top of the detonator holder. |
| Operation |
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When the bomb is dropped, the safety wire is cut and the safety pin is with- drawn. As the vanes rotate, the arming screw advances near the detonator until the striker rests on the recess in the fuze. |
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On impact, the striker remains stationary, and the detonator holder overcomes the creep spring and hits the striker. The flash from the detonator passes directly to the booster or through the delay and relay pellets to the booster. |
| Remarks |
| Fuzes are marked to show the following functions: |
| S.R. - Instantaneous C.R. - (Short Delay) 0.05 seconds L.R. - (Long Delay) 0.15 seconds |
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Figure 263 |
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