FARM MECHANICS. 



165 



580. At what average rate should two 1,500-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 

 draft 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}^-inch tire on a hard, smooth 

 road of broken stone? 



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

 1^-inch tire is used on a hard, smooth gravel road? 



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

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

 ground? What draft with 1^-inch tires? 



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

 working full time pull a 1,500-pound wagon loaded with 

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

 is a stiff loam mud? With 1^-inch tires? 



585. Greasing the Axle, Experiments made at the 



