Paper, 'The electric strength of mixtures of nitrogen and hydrogen' by P G Fawcett Fawcett writes: 'The experiments described in this paper were undertaken at Professor [Joseph John] Thomson’s suggestion, and have been carried out with the advantage of his advice and help. The immediate object of the experiments was to determine the electromotive force required to produce a spark between two flat parallel metal plates in a mixture of hydrogen and nitrogen in different proportions and at different pressures.' Annotations in pencil and ink. Includes nine diagrams of experimental apparatus and results. Subject: Electricity Received 21 June 1894 / 26 July 1894. Read 21 June 1894. Communicated by Thomson. A version of this paper was published in volume 56 of the Proceedings of the Royal Society as 'The electric strength of mixtures of nitrogen and hydrogen'. 1894