Devices that initiate the firing of muzzle-loading cannons. Comprised of a copper tube filled with powder attached to the vent of the cannon with its tip in the powder charge. On this tube a short tube containing a friction composition. Lying in the composition was the roughened end of a wire slider, The other end of the slider was twisted into a loop for hooking to the gunner's lanyard. Pulling on the lanyard caused the slider to ignite the composition.
