11 



commercial gasolene of the grade commonly used for fuel is found. 

 Products of that .nature appear to yield from 9,700 to 11,000 calories. 

 In so far as heating purposes are concerned, therefore, it is evident 

 that gasolene, weight for weight, is more valuable than alcohol. 



ALCOHOL MOTORS. 



It is quite certain that the use of alcohol motors on the farm will 

 become quite common as soon as the technique of construction is 

 practically complete and the price of alcohol is sufficiently low. 

 Alcohol can be used for all purposes for which gasolene is employed, 

 namely, the driving of wagons, carriages, stationary motors, water 



FIG. 8. Adaptation of an alcohol motor for plowing. 



pumps, mowing machines, plows, etc. Very little change need be 

 made in the engine of a motor car designed to use gasolene to fit it for 

 the use of alcohol. Gasolene becomes volatile at a temperature of 

 blood heat (98.5 F.) , while a much greater degree of heat (158 to 176 

 F.) is necessary to volatilize alcohol rapidly enough for motor purposes. 

 This fact makes necessary a change in the explosion chamber of the 

 engine when alcohol is to be used. This adjustment is especially 

 important in the starting of the machine, as after it is in action the 



