Abstract
THE obituary notice of the late Mr, Mallock in NATURE of January 6 refers to his experiments on the trajectories and extreme range of rifle bullets. It was in 1896 that I began an association with Mr. Arnulph Mallock which continued actively until his health failed a few years ago. He was always interested in rifle matters as well as in big guns, and first came to me at the suggestion of the late Sir Henry Halford, whom he knew through Mr. W. E. Metford, to consult me as to an optical rifle sight which he had devised. Together we made at various times many experiments, such as one on the rate of increase of the velocity of a bullet when fired ; a ballistic pendulum was used and the barrel was cut down by stages. In connexion with questions of air resistance,; he also carried out trials with bullets having a velocity as high as 4,000 ft. per sec., using for this purpose a special cordite and a bullet of spherical shape.
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