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These experiments were undertaken principally with a view to determine the most advantageous situation for the vent in fire-arms, and to measure the velocities of bullets, and the recoil under various circumstances.

philosophical transactions of the royal society of london

XV. New experiments upon gun-powder, with occasional observations and practical inferences; to which are added, an account of a new method of determining the velocities of all kinds of military projectiles, and the description of a very accurate eprouvette for gun-powder