FARM MECHANICS. 159 



throwing a furrow 9 inches by 5 inches of clay loam, the 

 total draft being 227 pounds? 



546. At the New Hampshire Agricultural College an 

 old-fashioned type of walking plow was used for plow- 

 ing a rich loam soil. The furrow slice was 13 inches 

 wide, by 8 inches deep. The total draft was 673.3 pounds. 

 What was the draft of each square inch of furrow? 



547. How much power is required when such a plow 

 is used, horses walking 1 2-3 miles an hour ? 



548. When three horses are used for pulling this plow, 

 what may be their weight, provided they walk at rate of 

 1 2-3 mile an hour and work for 10 hours each day? 



549. At the same college a modern type of walking 

 plow was used at the same time for plowing this land. 

 The furrow slice was also 13 inches wide and 8 inches 

 deep, draft being 400 pounds. What was the draft per 

 square inch of furrow when this plow was used? 



550. Using this modern plow and the three horses 

 found in problem 548, at what rate should they walk if 

 working 10 hours each day ? 



551. What per cent of time is saved by the modern 

 plow over the older type when the same horsepower is 

 used in both cases? How much time in a job requiring 

 120 hours with the older plow? 



552. How many horsepower are required when this 

 modern plow is used, the horses walking 2.5 miles an 

 hour? 



553. How many 1,600-pound horses are necessary for 

 this plow, when they are made to walk at a rate of 2.5 

 miles an hour and work for 10 hours each dav? 



