Percussion Caps are small copper cylinders, closed at one end, for conveniently holding the detonating powder which is exploded by the act of percussion in percussion-arms. See FULMINATES; also FIREARMS, Vol. IV. p. 639.
Percussion Caps
Chambers's Encyclopaedia, Volume 8: Peasant to Eoumelia, p. 43
Source scan(s): p. 0052