Council Minutes, on a paper 'The Earth's magnetic field in Southern Africa at the epoch, 1 July 1930' by E N Grindley Sectional Committee: Not stated [Physics] Discussion on the continuance of the publications as regards cost during the present emergency. As such, where possible, authors should 'limit their papers as far as possible to a description of new results.' [Published in the Philosophical Transactions of the Royal Society] No received date. 11 January 1940