[37] 



THE SCHOONER GRAMPUS. 

 25. CIRCULAR HAND SIEVES. 



473 



Hand sieves are used on the Grampus for washing such material as 

 is brought up in the dredges. 



"In working over small quantities of material, especially in search 

 of the smaller organisms, circular hand sieves, in nests, have been em- 

 ployed by the United States Fish Commission, of the same general pat- 

 tern as those described by Sir Wyvilie Thomson, in Depths of the Sea. 

 These have usually been constructed with wooden frames, in nests of 

 three to five sieves. Quite recently the wooden frames have been 



Fig. 4.— Grampus towing-net. 



changed for others of galvanized sheet-iron, with good results. The 

 old style of wooden frames, after a little use, lose their regular shape, 

 will not nest snugly, and the beading, which runs above the wire bot- 

 tom, is constantly becoming loosened and catching and concealing 

 many small objects. The metal sieves are made in nests of three or four, 

 one of the former and smaller nests being exhibited. In this, the lower 

 sieve measures 10 inches in diameter in the inside, the middle sieve 9J 

 inches, and the upper one 9J inches, the difference between these diam- 



