[87] U. S FISH COMMISSION STEAMER ALBA.TKOSS. 80 



wrong iside out a small piece of twine, with a knot on its lower end, is 

 allowed to bang down from it far enough to be gathered in with the end 

 of the net and secured with the lashing. 



The bridles are seized in scores cut in the arms for the purjjose. 

 When required for use the arms are inserted in the ends of the beam 

 and held in place by the set screws in the collars. 



DIMENSIONS OF WING NETS. 



Gal vaii'i zed-iron ring, diameter, 1 foot. 

 Galvanized-irou ring, diameter of iron, |- inch. 

 Net, length, 3 feet. 

 Pocket, length, 2 feet. 



SMALL BEAM TRAWL. 



The small beam trawl is used during bad weather, being easier to 

 handle and. bringing less strain on the dredge rope. The dimensions 

 of the frame and net- are as follows : 



Beam : 



Iron pipe, length, T feet 6 inches. , 



Outside diameter, 2J inches. 



Thickness of metal, -j^g inch. 

 Collars, brass, width, 2 inches J thickness, ^ inch ; length of flanges, 7 inches ; diam- 

 eter of bolts, f inch. 

 Kiinncrs : 



Length, 4 feet. 



Height, 2 feet 3 inches + 3 inches; total, 2 feet 6 inches. 



Width, 2 inches. 



Thickness of metal, f inch. 

 Weight of trawl frame, 140 pounds. 

 Rope for bridle, 2+ inches. 

 Rope for lead rope, 2 inches. 

 Rope for head rope, 1 J inches. 

 Trawl net : 



Length, 17 feet. 



Size of mesh, square, 1 inch. 



Material, cotton, barked, 2I-thread. 



Pocket, length, 6 feet. 



Pocket, size of mesh, square, 1 inch. 



Pocket material, cotton, barked, 21-thread. 



Jacket, length, 6 feet. 



Jacket, size of mesh, square, ^ inch. 



Jacket material, cotton, barked, 16-thread. 



The method of attaching the beams to the runners is the same with 

 both the deep-sea and beam trawl frames. Heavy brass collars are se- 

 cured to the ends of the beams by screw threads, and to the runners by 

 two bolts and nuts through each collar and runner, thus giving the 

 frames the required rigidity. The parts can be assembled and dis- 

 mounted in a few minutes; in fact, so readil^^ that it has become a 

 custom with us to dismount and stow the frames away whenever they 

 are not required for immediate use. 



