THE U. S. FISHERIES STEAMER ALBATROSS. 5 



Nets set tandem were one in front or one above another, with a 

 space of about 1 fathom between the tail of the first and the bridle 

 of the second. 



When two Kofoid nets were towed astern it is understood they 

 were side by side, on separate lines, about 10 to 12 feet apart. 



When nets were hauled vertically it is understood the haul was from 

 the depth indicated in the "Trial" column to the surface, unless 

 otherwise indicated. 



Beam trawls were almost always rigged with wing nets at each 

 side and mud bag at the tail. 



The various forms of apparatus employed are indicated by abbre- 

 viations and the manner of their use by affixed symbols, as follows: 



APPARATUS, ETC. 



8' Agassiz 8-foot Agassiz beam trawl. 



8' Alb-Blk 8-foot Albatross-Blake beam trawl. 



[The same abbreviation with other figures indicates the other sizes of the same apparatus.] 



hV Alb-Blk. spl ...52-foot Albatross-Blake frame, with a net designed for manganese 

 bottom. 



10' Blk 10-foot Blake beam trawl; similarly 5£-foot ditto. 



b. d boat dredge. 



botm .bottom. 



C. S Coast Survey. 



Cuhn 5-foot Cuhn net. 



D dredging, or collecting, station. 



e. 1 electric light. 



H hydrographic station. 



H. O .hydrographic office. 



int. 1 .open intermediate net 5 feet in diameter, about 11 feet long, with 



bobbinet, scrim and no. 12 silk lining. 



int. 2 .a net of 2-inch mesh web, about 10 feet in length, hung on a 4-foot 



ring, with a lining of i-inch mesh and linen. 



int. 3 a ship's net on a 5A-foot ring; net 13 feet long, or no. 000 grit gauze 



with about 3 feet of no. 3 silk, and a brass bucket attached at bottom. 

 In the work of the summer of 1905, 2 Kofoid nets, on 14-inch rings 

 and 6 feet in length, one on each side, either of no. 20 silk, K. 2, or 

 of no. 3 silk, K. 3, were used in conjunction. 



K. 1 no. 1 Kofoid or small plankton net, made of no. 12 silk, on a 12-inch 



ring. 



K. 2 no. 2 Kofoid or small plankton net, with no. 20 silk on 14-inch ring. 



K. 3 a similar type, of no. 000 silk, on a 2-foot ring. See also int. 3 above. 



Lt. Ho. . .Light-House. 



Luc. sdr for the Lucas sounding machine. 



m. 1) for mud bag. 



m. c mud can. 



pump-filter a bag or net of no. 12 or no. 20 silk, on a 14-inch ring, and 35 inches 



long, supported in a metal cylinder, so that a water pressure of Ah 

 inches could be developed. Into this bag water was run as taken 

 from the circulating pump and drawn from the main injection at 

 approximately 12 feet depth. A supply sufficient to keep the net 

 a little less than full was used, but for the reason that the pump afford- 

 ing this was frequently in demand for the evaporators, the opera- 

 tion of the filter was more or less discontinuous. 



