FIRE BY PERCUSSION.
Take a hollow cylinder, in fact, a syringe or pop-gun, of some bad conductor of heat—wood or thick glass—with this difference, that one end must be perfectly closed; it must have a piston like the syringe, also a bad conductor of heat, and which must be made to move in the cylinder perfectly air-tight. Place a bit of tinder or amadou, steeped in a solution of saltpetre in water and then dried, in the cylinder; then place the piston at the cylinder’s mouth, and with a sudden and powerful thrust condense the air in the cylinder: the tinder will ignite. Phosphorus wrapped in paper, and struck with a hammer on an anvil, will likewise enflame.