74 



THE VOYAGE OF H.M.S. CHALLENGER. 



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breadth, its weight being 137 lbs. ; the next size, which was made much stronger, was 

 4 feet in length, 9 inches in breadth, and weighed 259 lbs. ; and the smallest was 3 feet 



Dredge Rope 

 Swivel 



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Fig. 19.— The Dredge. 



in length, 1 foot in breadth, and weighed 85 lbs. The smallest was generally used in great 

 depths; and with it a successful haul was obtained in 3875 fathoms. 



