Letter from Edmund Clifton Stoner, on a paper 'The westward drift of the Earth's magnetic field' by Edward Crisp Bullard, Cynthia Freedman, H Gellman and Jo Nixon, to the Assistant Secretary of the Royal Society [D C Martin] Paper reference code: A80 Stoner writes: 'The general field of terrestrial magnetism is one in which I can claim no expert knowledge whatever, and I do not think that a report from me would be particularly valuable. It occurred to me that the paper might more appropriately be sent to, for example, Professor [Sydney] Chapman or Professor [Thomas George] Cowling.' Written at the Department of Physics, University of Leeds [England]. [Published in Philosophical Transactions A, 1950]. Endorsed on recto as received 12 May 1950. 11 May 1950