64 BULLETIN OF THE MUSEUM OF COMPARATIVE ZOOLOGY. 
Fig. 5. The dredge, as modified by Captain Sigsbee and Mr. Jacobi, in use 
on the “Blake.” The end of the dredge-bag was, as in the trawl, securely 
tied and fastened to the frame, to prevent its reversing. A trap, as in 
an ordinary lobster pot, also prevented the washing out of many specimens 
when the dredge came to the surface. The opening of this dredge was 
4 ft. by 12 inches. 
Fig. 6. Section of Fig, 3. 
Fig. 7. In a sketch of the double trawl (10 ft. beam) used on board the 
“Blake,” the end of the trawl was securely tied so as to gain easy access to the 
specimens accumulated at the end of the trawl. A set of cork floats suspended 
in the middle of the trawl kept one side of the net well up from the bottom. 
The trawl had the usual trap. To the end of the trawl a common wooden 
detacher, similar to that of a deep-sea sounding machine, was fastened for 
detaching the shot with which it was usually weighted. At great depths 
weights were attached to the runners, The trawl was strengthened by ropes 
forming a large network to support it. 
I hope, in my next letter, to be able to give detailed drawings of 
Captain Sigsbee’s water-bottle and of his modifications of Sir William 
Thomson’s sounding-machine, 
