Friction primer

A friction primer is a device to initiate the firing of muzzle-loading cannon. Each friction primer consists of a copper tube filled with gunpowder. The tube fits into the cannon touch hole burying its lower end in the gunpowder chamber. The top end of the tube extending above the touch hole has a short perpendicular spur tube filled with a priming mixture of antimony sulfide and potassium chlorate. A roughened wire slider extends from the outer end of the spur tube through the priming mixture and the gunpowder tube. This slider wire is twisted into a loop on the opposite side of the gunpowder tube. rdf:langString