The armament included 394 guns of all calibres, 6 of which were of 250 millimetres, 4 of 240, and 12 of 200.
(9) c 2 Ci If the shot is moving as if fired from a gun of calibre d inches, in which the rifling makes one turn in a pitch of n calibres or nd inches, so that the angle S of the rifling is given by tan S = ird/nd = 2 d p/u, (10) '°If a denotes the density of the metal, and if the shell has a cavity homothetic with the external ellipsoidal shape, a fraction f of the linear scale; then the volume of a round shot being sird 3, and sird 3 x of a shot x calibres long W =*ird 3 x(I -f 3)v, (20) 2 Wki 2= 61rd 3 xo(I-f 5)Q, (21) Wk22=67rd3x 2 2+0 2(I - f5)Q.
Table of Rifling for Stability of an Elongated Projectile, x Calibres long, giving S the Angle of Rifling, and n the Pitch of Rifling in Calibres.
26 and went on for 56 hours; about 1,600 guns of all calibres took part in it, yet so formidable were the hostile defences that the task of the infantry still remained one of great difficulty.
Gun, capable of being lengthened to loo calibres or 50 ft.
Velocity 12 14 16 18 20 22 24 26 23 30 32 34 36 38 40 42 44 46 from Chronoscope experiments in 6 inch gun of ioo calibres, with Cordite.