Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 148,162 pages of information and 233,682 images on early companies, their products and the people who designed and built them.
Adrian Francis Sykes (1889 - 1959), B.Sc., A.M.I.E.E. Managing Director, Sykes-Morris Submarine Acoustics, Ltd.
In association with Professor MacGregor-Morris, M.I.E.E., invented and developed the portable directional hydrophone.