Percussion cap

The percussion cap , introduced around 1830, was the crucial invention that enabled muzzle-loading firearms to fire reliably in any weather. Before this development, firearms used flintlock ignition systems which produced flint-on-steel sparks to ignite a pan of priming powder and thereby fire the gun's main powder charge. The flintlock mechanism replaced older ignition systems such as the matchringowrmlock and wheellock. Flintlocks were prone to misfire in wet weather, and many flintlock firearms were later converted to the more reliable percussion system.
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Noun
1. a detonator that explodes when struck
(hypernym) detonator, detonating device, cap
(part-meronym) mercury fulminate, fulminate of mercury, fulminating mercury

percussion cap /pə:'kʌʃnkæp/
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CAPSULA (DI CARTUCCIA)

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