Letter from Cecil Ryther Acklom, Royal Naval Torpedo Factory, Greenock, to Dugald Clerk, 57 & 58 Lincoln's Inn Fields, London Coommenting on the curiosity of their letters crossing. The conversion of cold torpedoes to 'heaters' is in abeyance owing to pressure of other work. There are few companies in Britain able to work to the accuracy required for complete interchangeability. 6 March 1915