FLUSHING 



223 



in action. The method has an advantage in that it requires 

 no deep excavation, and the mechanism can be set after the 

 manhole is built. 



Of late years the Pacific Flush- tank Co., having obtained 



FIG. 66. 

 Single " Merritt " Automatic Siphon. 



control of the Rhoads- Williams Tanks, and having made a num- 

 ber of modifications, combinations and improvements on its 

 own tanks, is able to supply flush-tanks of a great variety of 

 forms and sizes. The use of automatic siphon control in con- 



