WAGONS, BUGGIES, AND SLEDS 



251 



EFFECT OF HEIGHT OF WHEELS ON DRAFT * 



Draft in Pounds per Ton 



The width of tire also influences the rolling resistance 

 to a great extent. The wide tire on a soft road bed is 

 able to carry the load to better advantage and prevent the 

 wheel cutting in as far as it would otherwise. 



The rolling resistance as indicated in the above re- 

 marks depends largely upon the condition of the road sur- 

 face. The harder and smoother the road surface the less 

 will be the rolling resistance. It is for this reason that 

 much larger loads may be hauled upon good hard roads 

 than upon poor soft ones. Prof. J. H. Waters, at the 

 Missouri experiment station, has conducted extended ex- 

 periments to determine the influence of the width of tire 

 upon the draft of wagons when used on various road 

 surfaces. The wheels used were of standard height and 

 were provided with i^-inch and 6-inch tires. The sum- 

 mary of the results of these experiments states that the 

 wide tires gave a lighter draft except under the follow- 



* Missouri Agricultural Experiment Station, Bulletin No^ 52, igoi. 



