Referee's report by Alexander Russell, on two papers 'Triboelectricity and friction.—VI. On surface strain and relaxation for unlike solids' and 'Triboelectricity and friction. VII.—Quantitative results for metals and other solid elements, with silica' by P E Shaw and R F Hanstock Sectional committee: Physics Both papers recommended for publication in Proceedings, in full. [Part VI published in Proceedings of the Royal Society A, 1930]. [Part VII published in Proceedings of the Royal Society A, 1932]. Endorsed on verso as received 16 May 1930. 15 May 1930