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| U.S. EXPLOSIVE ORDNANCE |
| PART 2 - ROCKET AND ROCKET FUZES |
| Chapter 6 - ROCKET FUZES |
| Section 4 - ARMY BASE FUZES (EXPERIMENTAL TYPES) |
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T156 |
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Rocket uses in |
4.5-inch S.A.P. T78 |
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Weight, pounds |
1.39 |
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Over-all length, inches |
2.81 |
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Diameter, inches |
2.3 |
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Functioning |
0.01 second delay on impact |
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General: The T156 is a modification of the Artillery Fuze M68, without the tracer and with the retaining spring holding the firing pin block. Also the safety washer is 0.02 inch rather than 0.04 inch thich as in the M68 |
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Description and operation: The retaining spring, which is slotted and fits around the neck of the firing-pin block, holds the firing-pin block in a safe position, until the spring is removed by the pull ring before affixing the motor to the rocket head. The expansion plug acts to hold the spring in place during shipment. |
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On impact of the rocket, the firing-pin block is forced down by inertia on the safety washer, a thin aluminum disc, bending the washer, and striking the primer. The primer sets off the delay pellet (0.01 second) and then the detonator, which, in turn, explodes the booster charge of tetryl. |
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Figure 145. Army Base Fuze (Rocket) T156 |
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