Vitriol, Blue.—Called sulphate of copper. See Blue Vitriol.
Vitriol, Green.—Sulphate of iron. See Copperas.
Vitriol, Oil of.—See Acid, sulphuric.
Whiting, Spanish.—See Spanish Whiting.
CHAPTER XLI.
CALIBRES OF GUNS, RIFLING, TWIST OF RIFLING, ETC.
European Guns.—The Enfield Rifle; Muzzle Loader, Cal. 577; 3 grooves; regular twist, slightly deeper at breech than at the muzzle; rifling one turn in 6 feet 6 inches.
The Purdy Rifle, Muzzle Loader; Cal. 650; 4 grooves; increasing twist, commencing at one turn in 6 feet and ending at one turn in 4 feet 9 inches.
The Wilkinson Rifle, Muzzle Loader, Cal. 530; 5 grooves with a regular twist of one turn in 6 feet 6 inches.
The Lancaster Rifle, Muzzle Loader. Bore smooth and elliptical diameter at muzzle; greater axis, 550; lesser axis, 540; greater axis at breech, 557; lesser axis, 543. The twist is one quarter turn in whole length of barrel. Length of barrel, 39 inches.