rhe Oceaji" 



INSTRUMENTS 



USED IN OCEANIC RESEARCH 



Plate I 



^/■g. ?. Lucas sounding machine 



,, 2. Otter trawl 



,, 3. ^' Challenger" dredge 



4. ,, tow-net used uertically 



5. ,, )j horizontally 



r.J.Pcarcey.dd- 



. 6. "Michael Sars" vertical tow-net 

 7_ ^ towing several nets simultaneously 



8. Reversing thermometer 



9. Reversing water-bottle with thermometer 

 10. Helland-Hansen photometer 



