12 



temperature of combustion is quite sufficient to easily produce the 

 gasification necessary. 



Fig. 8 represents an ordinary plow suitable for attaching to a heavy 

 motor apparatus driven by alcohol; fig. 9, a mowing machine, and 

 fig. 10, a reaping and binding machine, both driven by alcohol motors. 

 In regard to these heavy machines it may be said that they probably 

 would come into use only on large farms where the surface of the 

 soil is practically level. They would not be suitable for small farms 

 nor those in hilly sections. In this connection attention is called to 

 the fact that steam plowing, altho practicable and profitable under 

 certain conditions, has not been practised to any great extent in this 

 country, in fact, not nearly so much as in England. It is not likely, 

 therefore, that plowing and harvesting by alcohol motors will come 

 into use very soon, altho the possibilities are worthy of the considera- 

 tion of the thoughtful farmer. On the other hand, it seems probable 



FIG. 9. A mowing machine propelled by an alcohol motor. 



that small motors for driving machines for chopping and grinding 

 cattle food, pumping water, and similar purposes may be brought 

 into very general use as soon as the denatured alcohol becomes cheap 

 enough to render its use practicable. 



In the driving of motor engines the quantity of heat evolved is 

 not always a measure of efficiency. It is not the purpose of this 

 bulletin to go into this subject at all, only to say that the vapor of 

 alcohol can be more highly comprest at any given temperature 

 without exploding than can the vapor of gasolene. As the decreased 

 volume of the mixture of the explosive vapor and air is to a certain 

 extent a measure of efficiency when engines are driven by the expan- 

 sion of gases, the high degree of compressibility of the alcohol vapor 

 without danger of explosion may compensate for the smaller quantity 

 of heat which is generated by its combustion. 

 200 



