Referee's report by Arthur Schuster, on a paper 'A recording calorimeter for explosions' by Bertram Hopkinson Sectional Committee: Physics and Chemistry Recommended for publication in the 'Proceedings of the Royal Society of London'. Suggests illustrations should be reduced in size if possible. [Published in the 'Proceedings of the Royal Society of London'] Endorsed on verso as received 11 January 1907. [January 1907]