PATENT EOLLEE SPAWNING BOX. 



These screens are t© be filled with coarse gravel, 

 and the eggs pass through as in Ainsworth's screens. Un- 

 der these is an endless apron of fine wire cloth, (B), pass- 

 ing over rollers at the two ends of the box. This apron of 

 wire cloth is about one inch beneath the upper screen, and 

 is kept in its place and prevented from sagging by small 

 cross-bars, (two of which are seen in the cut), correspond- 

 ing to the divisions of the upper screen and running in 

 grooves in the sides of the box. These cross-bars also keep 





the eggs from being carried down by the cun'ent. The 

 front roller can be turned by the handle seen at G. As 

 the roller is turned forward it moves the screen with it, 

 and, of course, the eggs as they come to the edge of the 

 roller will fall off". The pan, C, (fig. 2) is placed in front 

 of the roller, receives the eggs as they fall, and the opera- 

 tion is complete. The box need not be more than two feet 

 deep, and may be made only eighteen inches deep ; it is 

 set directly in the raceway, and intended to fill it com- 

 pletely. The water enters in the direction of the arrows, 

 and may either enter with a fall over the top of the box, 

 as seen in figure 1, or the top of the box may be cut down 



