Letter from Thomas Gold to Professor Harry Messel, School of Physics, University of Sydney Telling Professor Messel that Dr D Heeschen wants to cooperate with them as regards the design of a 'large instrument', but he seems not quite sure as to how to go about it. Arranging a conference on the future of very large radio antennas. Proposing to invite Dr Heeschen, Dr Svenson and Dr Findlay to a meeting. 21 July 1965