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Knight's Mechanical Encyclopedia (ed. Knight), B. (search)
receive a black mark by contact with the bullet. Bul′let-screw. One at the end of a ramrod to penetrate a bullet and enable the latter to be withdrawn from the piece. See ball-screw. Bullet-shell. An explosive bullet for smallarms. Jacobs's bullet-shells, used with the rifle of General Jacobs of the East India service, have an inclosed copper tube containing the bursting-charge, which may be fulminate or common powder, and is exploded by a percussion-cap or globule on striking. General Jacobs of the East India service, have an inclosed copper tube containing the bursting-charge, which may be fulminate or common powder, and is exploded by a percussion-cap or globule on striking. In experiments made with them at Enfield in 1857, caissons were blown up at distances of 2,000 and 2,400 yards; and brick-walls much damaged at those distances by their explosion. See bullet. Bul′ling. （Blasting.) Parting a piece of loosened rock from its bed by means of exploding gunpowder poured into the fissures. Bullion. 1. A word whose original meaning indicated a rounded stud or ornament, and came to mean a metallic clasp, boss, hook, button, or buckle. The meaning has <
Knight's Mechanical Encyclopedia (ed. Knight), R. (search)
nish in depth from the breech to the muzzle. The Swiss Federal rifle, introduced in 1848 by Colonel Wurstemburger, has eight grooves with a twist of one turn in three feet. In this the bullet is not expanded, and it has enjoyed a high reputation for accuracy. The caliber is small, 41 inch, the bullet weighing 257 grains, and the powder charge 62 grains. The plan of having studs or ridges on the bullet to engage the grooves has not been extensively adopted for smallarms. The rifle of General Jacobs, East India service, employs a bullet of this class, having four ridges corresponding to the four grooves of the rifle, and used with a patch. In Murphy's mode, the rifling only extends four inches from the muzzle, and has its pitch lefthand-ed to correct the slight tendency to pull the gun over to the right in pulling the trigger. The Whitworth rifle has a hexagonal bore; the Westley Richards carbine, an octagonal bore; the Lancaster carbine, an elliptical bore, or it may be descr