FARM MECHANICS. 



167 



front wheels, how niany pounds may be hauled with the 

 same draft when the load is placed on hind wheels? 



592. If 2.000 pounds may be hauled with an expendi- 

 ture of 109 pounds of draft when load is distributed 

 equally on the four wheels, how many pounds may be 

 hauled with the same draft when the load is placed on the 

 hind wheels? 



Draft of Some Other Farm Implements. 



Oral Problems. 



593. How many horses would be used in each instance 

 as suggested by draft? Consider weight of horse, and 

 rate he should walk per hour when working 10 hours per 

 day ? Make estimate only in round numbers and approx- 

 imately. 



The effect of grades. A grade may be ascending or 

 descending. If ascending the draft is increased; if de- 

 scending, it is decreased. The amount of increase or de- 



