Correspondence with various individuals and societies regarding meetings, membership, papers read, etc., including the British Astronomical Society, 1949-1954; the British Astronomical Society Scottish Branch, 1953; Sir Howard Grubb, Parsons and Co. Ltd, 1952; D.A. Campbell, 1952; Professor Kopal of Manchester University, 1952; Dr G. Merton, 1952; Arthur C. Clarke, 1952; the British Interplanetary Society, 1952; the Société Chronométrique de France, 1950; Dr E.C. Bullard, National Physical Laboratory, 1950; D.H. Sadler, 1950; and Dr J.G. Porter, 1950.