214 



VICTOR E. SHELFORD AND W. C. ALLEE 



ratus and is distributed on the topmost sieve. From there it 

 flows through the series of sieves to the collecting pan P. From 

 here it is conducted to boiler H by means of several small alumi- 

 num tubes which reach to the bottom of the boiler and thus 

 introduce the water as near the heat as possible. The water is 

 conducted from boiler H through a large pipe attached to its 



Fig. 1 Apparatus for the control of gas content of water. For description of 

 the course of the water, see text, p. 213. The water supply pipes are f inch 

 reduced to f inch above the branch going to the cooler from the cold water pipe 

 and to the three way valve from the hot. The valves A, B, and M, are f inch 

 straight way valves. Above valves A and B are swing check valves C, D to pre- 

 vent the water's backing into the coolers when a mixture is used. The float valve 

 is one manufactured by L. Wolf Manufacturing Company, with ground brass 

 union'soldered to the delivery tube. The shape of the valve makes necessary a 



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