Letter from John David Griffith Davies, to E G Richardson, regarding a paper 'Supersonic dispersion in gases II. Air containing water vapour' by M Mokhtar and E G Richardson Sectional Committee: Physics In response to his request for a few copies, the rules on confidential papers is to send just one copy each to the authors and communicator. In this case this would be three copies. Assumes this will be sufficient, unless he wishes to send a special request for a further limited number of copies. Appended request slip from E G Richardson for 50 copies of the paper. Note in pencil at side highlights 3 copies. [Published in the 'Proceedings of the Royal Society of London'] No received date. 13 March 1940