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20 inches absolutely sound accuracy air cells angle of elevation armour plate axis axle B.L. Gun barrel bearing surface breech block bursting charge calibre cast iron charge of powder compressed steel cylinder diameters in length diameters long Enfield rifle enlargement experiments feet figure of merit flat flat-headed projectile fluid fluid-compressed steel Form of Projectiles gave a range grooves Hythe inch thick increased ingot iron plate long projectiles Lord Hardinge Lord Panmure Mean deflection Mean range Mean variation mechanical metal Metford minimum diameter muzzle obtained ounces penetration Pitch of rifling polygonal powder chamber powder charge pressure Range in yards recoil revolutions per minute rotation rounds fired screw screw thread SECTION service guns shell weighing Shoeburyness sound ductile steel steel bullet stud system tensile strength tons trajectory trials tube turn in 20 turn in 78 water line Whitworth 9-pounder Whitworth and Enfield Whitworth rifle windage wrought iron