sJ^y/Y\^(/\ .Machine Jitel. 



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 QorrocOed f> m/jcraturc j J 

 Air S Surface 

 Trawl OF dredge or tmfioi 



SOUNDING WIRE. 



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JOO 

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I $00 

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 , 7 ,»> 

 1800 

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2400 



Depth 



Drift. 



DREDGE ROPE 



f.-.H N. 



