Experiments with the Hopkinson pressure bar

Abstract

In November, 1913, the late Professor Bertram Hopkinson read a paper before the Royal Society entitled “ A method of measuring the Pressure produced in the Detonation of High Explosives or by the Impact of Bullets.” (‘ Phil. Trans.,’ Royal Society of London. Series A, vol. 213 ; and Collected Papers, p. 438.) After this paper further experiments with gun-cotton were made by one of us, who was assistant to Prof. Hopkinson, and these were continued until the beginning of the War in 1914. During this time very numerous results were collected, but unfortunately these had not received the consideration or criticism of Prof. Hopkinson at the time of his death.