Tamn^f^y^ Cor, + o Depth t J 



.slioi or lead ^ ytJ^f^ 



. Vo. of Uterinom^iter Cor* 



Air Bur face Dnft 

 Tra wl or dredga 



SOUNDING WIRE. 



DOWN. 



2^ 



TUK«J!, 



0 

 ]00 



200 

 300 

 400 



500 



900 

 low 

 IW 

 uoo 



ijnc) 

 atoa 



330a 



DREDGE ROPE 



OP. 



•^1 



