Definition

1. Noun:
   • A small metal or paper cap containing a small amount of explosive compound: It is designed to be placed in the nipple of a firearm. When struck by the firearm's hammer, it detonates, igniting the main propellant charge in the gun barrel.

Usage

• The term "percussion cap" is used specifically in the context of firearms, weaponry, and historical technology. It refers to the ignition component in percussion lock firearms, which replaced the earlier flintlock mechanism.

Examples

• Noun:
  • The invention of the percussion cap in the early 19th century made firearms more reliable in wet weather.
  • He carefully placed a new percussion cap on the nipple before taking aim.

Advanced Usage

• Historical Context: The percussion cap was a pivotal innovation in firearm technology, leading to the development of modern cartridges. It is a key component in muzzleloading firearms and some antique revolvers.
• Collecting: Original and replica percussion caps are collected by firearms historians and enthusiasts.

Variants and Related Words

• Cap: A general term; in firearms, it can refer to a percussion cap.
• Detonator: A broader term for any device used to initiate an explosion.
• Primer: The modern equivalent in centerfire cartridges, serving a similar ignition function.

Synonyms

• Ignition cap
• Fulminate cap

Related Phrases

• "To cap a nipple": The action of placing a percussion cap on the firearm's nipple.
  • After loading the powder and ball, the next step is to cap the nipple.

Noun

1. a detonator that explodes when struck