52 



FISH FARMING : 



the pond at will. Fig. 12 is a sectional elevation of the sluice 

 through a line A B (i.e., from back to front, centrally), marked 

 in Fig. 13, which is a sectional plan of the contrivance through 



A CONTROLLING SLUICE FIXED IN AN EMPTY POND. 



a line c D, marked on Fig. 12. Fig. 14 is a section through a 

 line E F in Fig. 12. The sluices are made and fixed after the 

 following manner : 



Three stout boards, marked G, are firmly fixed together in 



