REMOVAL OF CARBON SULPHUR COMPOUNDS FROM COAL 179 



of this kind advocated by Prof. W. K. Lewis. The laws are 

 Raoult's law of vapor pressure lowering, Dalton's law of partial 

 pressures and the distribution law for dilute solutions. 



Using graphs of operating results and lantern slides he 

 indicated that this mathematical theory with formulae built 

 on it, explains all the physical-chemical details encountered and 

 enables the prediction of the results to be expected under given 

 conditions. 



From the standpoint of the chemist the absolute accuracy 

 of this mathematical theory has not been proven owing to the 

 fact that he did not have at his disposal a method for deter- 

 mining the minute quantities of carbon-sulphur compounds 

 in the oil. From the standpoint of the operating engineer the 

 theory is alright, because it explains the process and provides 

 a vehicle for studying it; also, the theory has not yet been 

 found wrong in any application of it. 



