Letter from Dr de Lange, Jermyn Street Hotel, Jermyn Street, to the Director of Navy Contracts, Admiralty, London Requesting a fuller report on the Thermo Telephone and why they were deemed 'too delicate'. He has asked Dugald Clerk to bring the matter before the Scientific Committee of the Admiralty. In order to recommmend improvements to Clerk, a report or conversation with the officers in charge of the experiments would be valuable. 22 June 1915