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doi: 10.1038/064445a0
WHEN the Council of Military Education directed my attention to the science of ballistics in 1864, I came to the conclusion that a thoroughly good chronograph would solve all practical difficulties. The newly-invented instrument was first tried in 1865 with ten screens 120 feet apart, by the ue of a 12-pr. Armstrong B.L. gun, when eleven satisfactory rounds were obtained. (Report (84/B/1941), and (Proc. of the R.A. Inst., 1866.) Afterwards Government decided to have systematic experiments made to determine the resistance of the air to ogival headed projectiles (1.5d) fired from 3, 5, 7 and 9-inch M. L. guns, which were carried out in 1867–68 for velocities 900 to 1700 f.s. The results then obtained are still in use.
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