FARM MECHANICS. 



165 



580. At what average rate should two l..jOO-pound 

 horses walk with two tons of hay on an 1,800-pound high 

 wheel wagon in wet sod? Low-wheel wagon? 



The width of tire. On good roads wide tires give less 

 tlraft than narrow tires. They are also better for the 

 road. Experiments conducted by the Missouri Experi- 

 ment Station resulted as follows: 



Draft in Pounds per Ton of Total Weight. 



581. What per cent of power is saved by the use of 

 a 6-inch tire rather than a l^'l-inch tire on a hard, smooth 

 road of broken stone? 



582. What per cent of the power is wasted when a 

 13/2-inch tire is used on a hard, smooth gravel road? 



583. What is the draft of an 1,800-pound wagon with 

 (i-inch tires, carrying a load of two tons over plowed 

 ground? Wliat draft with ly2-inch tires? 



584. At what rate should two 1,200-pound horses 

 working full time pull a l.r)00-pound wagon loaded with 

 three-fourths ton. and having 6-inch tires, when the road 

 is a stiff loam mud? W^ith IjX-inch tires? 



585. Greasing the Axle. Experiments made at the 



