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sprężyn(k)a iglicy zapalnika
w dawnych minach i granatach ...
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Removal of the retaining pin freed a heavy ball-bearing and striker inside the fuze, which was then held back from the percussion cap only by a weak creep spring. In this manner the Allways fuze became armed in flight. Impact with the target gave the heavy ball-bearing a sharp jolt - overcoming the weak resistance of the creep spring - that slammed the striker against the percussion cap. - https://en.wikipedia.org/wiki/Gammon_bomb
Discussion
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Removal of the retaining pin freed a heavy ball-bearing and striker inside the fuze, which was then held back from the percussion cap only by a weak creep spring. In this manner the Allways fuze became armed in flight. Impact with the target gave the heavy ball-bearing a sharp jolt - overcoming the weak resistance of the creep spring - that slammed the striker against the percussion cap. - https://en.wikipedia.org/wiki/Gammon_bomb
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percussion cap creep spring - https://goo.gl/11KfPU