Referee's report by John Allen Harker, on a paper 'The consumption of carbon in the electric arc. I - Variation with current and arc-length. II. - Influence upon the luminous radiation from the arc' by W Geoffrey Duffield Sectional committee: Physics and chemistry Recommended for publication in Proceedings, although it should be condensed. [Published in Proceedings of the Royal Society A, 1915]. Endorsed on verso as received 24 July 1915. July 1915