10 



Transactions of the Society. 



means of Y tubes or other simple device. The height of D is 

 greater than that of the siphon in order to insure that under no 

 circumstances will water find its way into the rubber tubing. The 

 width of D and the bevelling of its lower end insure that any 



M 



A. 

 B. 

 C. 

 D. 

 E. 

 F. 

 G. 

 H. 

 K. 



Inflow of water (constant). 

 Water-valve vessel. 

 Pressure vessel. 

 Aerating tube. 

 Siphon. 



Water-valve tube. 

 Overflow tube. 

 Aerating nozzles. 

 Rubber tubing. 



CI. Screw clamps. 



Fig. 1. 



water which may have got into it will readily fall back into the 

 vessel C when this vessel is being emptied by the siphon. 



E. Siphon. One end passes through the bung almost to the 

 bottom of the vessel C, while the other end goes to an outlet and 

 reaches not less than 1A to 2 ft. below the level of the first. The 



