Copy letter from Edwin Deller, Assistant Secretary of the Royal Society; to H. W. Hilliar Esquire; Patent Office Informs Mr. H. W. Hilliar that the Society received a letter from the Admiralty stating it is undesirable from a national point of view to publish his paper, 'Experiments on the pressure wave thrown out by submarine explosions', and are witholding permission to publish. 25 October 1920