328 BULLETIN OF THE UNITED STATES FISH COMMISSION. 
ratchets on the forward end, into which a pawl falls to prevent its turn- 
ing back. 
Fig. 13. The Dummy. 
The trawl-roller of a vessel of 70 to 75 tons will be 14J inches long, 
11 inches diameter at the ends, 7 inches diameter in the center. The 
rail is fixed so that it will turn back on a hinge, and a piece of bulwark 
is made to fit in snugly over the roller when it is not in use, but is, of 
course, removed whenever the trawl-warp is hove in. (See Fig. 15.) 
On the single-masted trawlers at Brixham and Plymouth the trawl- warp 
roller, which is much shorter, is placed on the port side of the stem- 
head. 
(/). Dandy Bridle Chock. 
Fig. 16. 
A large iron chock, with a roller fitted into it (see Fig. 10), is secured 
to the port side of the taffrail. When the after end of the trawl is being 
