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Date

Hydrophone, Type MkII

1916

Sonic hydrophone with cable reel

Hydrophone insert for streamer

Deep-sea hydrophone, oil-filled, pressure compensated.

Deep-sea hydrophone

1920
Hydrophone drifter set, complete, telephone headpiece, transformer & condenser

Hydrophone drifter set

1916
Two crystal inserts (hyprophone units) for hydrophone streamer. 5x4 diam cm

Two crystal inserts for hydrophone streamer

Type 719 hydrophone and reflector

Hydrophone and reflector

1950-1959
Section of marine hydrophone cable, with hydrophone.

Section of Marine Hydrophone Cable

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

Sound range hydrophone

Sound range hydrophone

1950-1959