69 
THE EQUIPMENT OF THE SHIP. 
CHAP. I. ] 
AN 
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(KY 
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4, 
-—The Deep-sea Trawl. 
18. 
Fic. 
lead 
along the bottom. Two iron 
, to drag 
rolls of thick sheet 
runners, like the runners of a sledge, are fixed one at either end 
of the beam, and the runners are 
so weighted themselves, and 
so weight the beam, that they tend, if fairly launched, to keep 
