Letter from Cecil Ryther Acklom, Royal Naval Torpedo Factory, Greenock, to Dugald Clerk, 57 and 58 Lincoln's Inn Fields, London Apologises for not keeping up their correspondence and encloses an ammonia report. Th eporposal to fit heaters to cold torpeodes has been dropped. The Cambridge Instrument Company are making an iron-constantan couple for their use. Relays technical data on engine temperatures. 5 March 1915