Hydrophone drifter set, complete, telephone headpiece, transformer & condenser Hydrophone drifter set 1916
End section of marine hydrophone cable, electrical connectors, oil filler plug and transformer group End section of marine hydrophone cable
Hydrophone, P.D.H. MarkI, with Xylonite baffle, Y piece, first devised by William Henry Bragg and Ernst Rutherford. Hydrophone with Xylonite baffle
Two crystal inserts (hyprophone units) for hydrophone streamer. 5x4 diam cm Two crystal inserts for hydrophone streamer