![](https://coimages.sciencemuseumgroup.org.uk/342/192/large_thumbnail_smg00178105.jpg)
![](https://coimages.sciencemuseumgroup.org.uk/342/192/large_thumbnail_smg00178105.jpg)
![](https://coimages.sciencemuseumgroup.org.uk/452/926/large_thumbnail_smg00257158.jpg)
Hydrophone, Type MkII
1916
![](https://coimages.sciencemuseumgroup.org.uk/424/241/large_thumbnail_smg00178978.jpg)
Hydrophone insert for streamer
Two crystal inserts for hydrophone streamer
Deep-sea hydrophone
1920
Hydrophone drifter set
1916
Hydrophone with Xylonite baffle
Hydrophone and reflector
1950-1959
Section of marine hydrophone cable
End section of marine hydrophone cable
Sound range hydrophone
1950-1959