546 



Popular Science Monthly 



^<-l-L 



'Sci 



_W30— 





Above, an 8-16 horsepower tractor plowing 

 under a heavy growth of sunflowers 



To the left, an illustration which shows that 

 the possible width of furrow cut is much less 

 in proportion to the width of a small round 

 wheel tractor than in the larger outfit. The 

 plow must travel at or near the right-hand 

 side of the tractor or else the tractor must 

 move partially upon the plowed ground, 

 with a loss of tractive power and the undoing 

 of part of the plow's work 



Below, a tractor plowing with one drive-wheel 



in the furrow. The front wheel in the furrow 



helps to steer 



