122 



TRANSACTIONS OF THE 



■ «r-: 



Droii^hl Tulie for Soda Water. 



Code, Hopper cf Gralz''s Rotary Valve Dry Gas Metre. 

 "Wm. L. Shoelier & Co., agents, 135 William street, N. Y. 



The frequent va- 

 riation of registry 

 in the dry gas me- 

 tre, it is well 

 known, is occasion- 

 ed by the lifting of 

 the valve from the 

 valve seat, caused 

 by the accumula- 

 tion of solid matter 

 on the valve cover 

 or seat, and this 

 solid matter or de- 

 posit from the gas 

 is constantly car- 

 ried along the same 

 path, without being 

 removed. This is 

 overcome by the 

 adoption of a rota- 

 ting valve, con- 

 structed with its 

 surface broken by 

 sharp edges at each 

 and every circumfe- 

 rence, whereby the 

 deposit is removed, 

 thus keeping the 

 valve surfaces clean, 

 and preventing the 

 valve from leaking. 



Rotary Valve Dry Gas Metre, 



