APPENDIX 



243 



ferent road surfaces and according to the width of the 

 tire and the height of the wheels. The draught on hard, 

 level dirt roads with high-wheeled wagons was found by- 

 test to be 69 lbs. per ton of load. How many tons could 

 two 1,500 lb. horses draw steadily on such roads if the 

 pulling power of each horse was 1/10 of his weight ? Ans. 

 — 4.35 tons. 



8. The draught of the same wagon on gravel roads 

 with one inch of sand on top was 85 lbs. per ton of load. 

 How many tons could the same team draw steadily over 

 such roads pulling as in Exercise 5? Ans. — 3.5 tons. 



9. The draught of the same wagon on wet sod land 

 was 170 lbs. per ton load. How much could the same 

 team, pulling as in above exercise, draw over such 

 ground? Ans. — 1.76 tons. 



10. Copy the drawings below. Examine horses until 

 you find the wide and the narrow hock. 



Fk;. 119. Wide Hock. 

 This horse endures great labor 

 with little fatigue. 



Fig. 120. Narrow Hock. 

 This horse is easily fatigued. 



