150 



FARM ARITHMETIC. 



507. How much work would be done in plowing a 

 headland 60 rods long and 6 rods wide, with a furrow 

 12 inches wide and draft 500 pounds ? Draft 300 pounds ? 



508. A horse does 396,000 foot pounds of work in 

 drawing a certain wagon one-half mile ; what is the draft ? 



TRACK CONTRIVANCE FOR FEEDING CATTLE. 



The grain is prepared and mixed in the barn and later delivered by means 

 of track and cars to the feeding pens. In this way much labor is saved. 



509. Two horses draw a load whose draft is 300 

 pounds, at the rate of three miles per hour. What horse- 

 power is each exerting? A horsepower is 33,000 foot- 

 pounds per minute. 



Process : 



3 X 5,280 = 15,840 feet per hour. 



15,840 -4- 60 = 264 feet per minute. 



264 X 300 =79,200 foot pounds per minute. 



79,200 -:- 33,000 = 2.4 horsepower. 



2.4 -i- 2 = 1.2 horsepower each. 



Note. Working at this rate, this team should not be required 

 to work full time. 



510. At what rate should a horse walk when the draft 



