Referee's report by Sydney Chapman, on a paper 'An electrical calculating machine' by R R M Mallock Sectional committee: Mathematics Recommended for publication in Proceedings. The paper is is good and of a level of quality suitable for the Proceedings. The paper should be cut down to about a third of its current length. The more techincal areas of the paper should be instead published in the Journal of Scientific Instruments. [Published in Proceedings of the Royal Society A, 1933]. Endorsed on verso as received 7 April 1933. 5 April 1933