Referee's report by Sydney Chapman, on a paper 'Measurements of the variation with depth of the main geomagnetic field' by A C Benson, D H Griffiths, A F Moore and Stanley Keith Runcorn Sectional committee: Physics Paper reference code: A117 Recommended for publication in Philosophical Transactions. Chapman writes: 'The paper makes an important contribution to geomagnetic science, of a kind extremely difficult to achieve'. [Published in Philosophical Transactions A, 1951]. Date received not given. 7 June 1951