14 APPARATUS. 



TRAWL NET. 



The trawl net (see Plate II, No. 1) has a beam 

 of eighteen or twenty feet in length, the extent 

 of the beam being the breadth of the mouth of 

 the net, and the length of the net is from sixty 

 to seventy-five feet. In the representation of this 

 net the rope on the extreme left running through 

 the block is called the trawl-warp, and is the only 

 communication or connection between the boat 

 and the net when the net is overboard. The 

 ropes passing obliquely from the block to the 

 two sides are called the bridle, and serve effectually 

 to keep the open mouth of the net square to the 

 front when the net is drawn along over the 

 ground by the boat. The trawl-beam is four 

 inches in diameter, and is supported at the height 

 of twenty or twenty-five inches above the ground 

 by a heavy frame of iron, of a particular form, at 

 each end of the beam, called trawl-heads, which 

 assist by their weight to sink the net and keep 

 it on the ground. The upper edge of the netting 

 is attached along the whole length of the beam ; 

 the lower edge is fastened along a heavy rope, 



