HATCHING APPARATUS. 



75 



Fig. 3 is a transverse sectional view of the cylindrical bot- 

 tom B. 



" A represents a square box or case, made water-tight, 

 preferably of wood, and provided with a concave bottom, 



Fig. 2. 



shown at B, or a hopper bottom might do as well, the ob- 

 ject being to cause any sediment, etc., to be easily removed 

 through the discharge pipe p. There is a channel C formed 

 entirely around the case near the top. The outer walls of 

 such channel are somewhat elevated above the upper edge 

 of the case proper. This permits a gentle overflow from 

 all sides of the tray chamber, near the bottom of which is 

 fixed a ledge z, Fig. I, upon which the trays c may rest. 

 These latter consist of shallow rectangular frames, each 

 provided with a fine wire-gauze bottom, upon which the 

 spawn is deposited and held during the time of hatching. 

 There is a suitable metallic or other strap s attached to two 

 opposite sides of the bottom tray in each case of trays, 



