Report of the Physics Sub-Committee Reports on the research of the committee since the last meeting. Notes that experiments on the determination of the direction of long wave wireless signals have been 'brought to a successful conclusion' -- that the Admiralty has requested 'an arrangement for the detection of shorter waves' -- discontinuation of the experiments on the 'Beck lamp' -- consideration of various methods for the detection of mines -- discussions on the possibility of detecting steamships by heat radiation, periscope improvement, artificial fogs, the destruction of aircraft through heat concentration. Inserted pp13-14. [May 1915]