Maohine,/\ £ileefu 



Depth 



•^utt or lead . ,y 

 Boiiom Ujnparaturn ^ 

 Corrected' UmperatiLre 



Air Sur/ane Drift 



Trawl or dredge 



SOUNDING WIRE. 



DOWN. 



i;c)0 

 Coo 

 TOO 



ii> • I 

 laoo 



lAVO 



1500 

 tOoo 

 1700 



tdOD 



2 too 



DREDGE ROPE. 



OOWN. 



UP, 



