Records of Research EstablishmentsADM 2121915 - 1977Admiralty: Admiralty Experimental Station and Admiralty Research Laboratory: Correspondence and Papers
The files in this series are arranged under the following headings: camouflage, degaussing (the neutralization of magnetism in ships, particularly as a defence against magnetic mines), early electronic research, optical and vision, rangefinders and underwater experiments. There is also a section of miscellaneous scientific papers and reports in which there is a file of correspondence between Sir Ernest Rutherford FRS and Professor William Bragg FRS during 1915 and 1916, relating to the directional hydrophone, a means of detecting submarines.