Letter from Edmund Taylor Whittaker, on a paper 'On sound waves of finite amplitude' by E T Copson, to D C Martin Paper reference code: A193 Whittaker sends Copson's paper in which he has made small changes suggested by the referee. A note from Copson is also attached. Written at 48 George Square, Edinburgh 8 [Scotland]. [Published in Proceedings A, 1953]. Endorsed on recto as received 3 December 1952. 2 December 1952