FLUSHING 221 



a portion of the confined air is forced around the lower bend, 

 and by its upward rush carries with it some of the water in the 

 short leg, thus destroying the equilibrium and the siphon is 



FIG. 65. 



brought into full action immediately. The water is then 

 drawn out of the tank to the bottom of the bell, the siphon 

 vented by the admission of air through the sniff-hole, and the 

 operation repeated. The secret of this invention is the free 

 projection of the overflow edge of the short leg of the trap, 



