9S8 ANNUAL REPORT OF THE OfE. Doc. 



1 to 2^ inches. Wide tire forced most of the slush out of its track. 

 No rut remained. Trial made October 12, 1896. Length of run, 400 



feet. 



Average draft. 



Narrow tire, 262.3 pounds. 



Broad tire, 268.1 



Difference in favor of narrow tire, 5.8 " 



Percentage difference in favor of narrow 



tire, 2.2 " 



(f) Water standing on surface. Loose sand and gravel to a depth 

 of about one inch, forming a slush, underlaid by hard roadbed. Both 

 sets of wheels cut through to the solid roadbed. No rut formed. 

 Length of run, 400 feet. March 19, 1897. 



Average draft. 



Narrow tire, 231.7 pounds. 



Broad tire, 240.8 



Difference in favor of narrow tire, .... 9.1 " 

 Percentage difference in favor of narrow 



tire, 4. 



With the draft required to draw a 2,000 pound load over this 

 gravel road on the narrow tires the following loads could have been 

 hauled on 6 inch tires: In the first trial, 2,666 pounds; in the second 

 trial, 2,908 pounds; in the third trial, 2,910 pounds; in the fourth 

 trial, 2,532 pounds; in the fifth trial, 1,956 pounds; in the sixth trial, 

 1,920 pounds; or an average for the six trials of 2,482 pounds, an 

 increase in the load capable of being hauled of 482 pounds on account 

 of the saving of draft from the use of the broad tires. 



■» 



III. Dirt Road. 



(a) Dry, hard, free from ruts and dust, nearly level. Trial made 

 August 28, 1896. Length of run, 400 feet. 



Average draft. 



Narrow tires, 137.3 pounds. 



Broad tires, 104.8 " 



Difference in favor of broad tires, 33.1 " 



Percentage difference in favor of broad 

 tires, 31.0 



(b) Dry, hard, free from ruts or dust, nearly level. Trial made 

 September 12, 1896. Length of run, 1,000 feet. 



Average draft. 



Narrow tires, 178.4 pounds. 



Broad tires, 145.3 " 



Difference in favor of broad tires 33.1 " 



Percentage difference in fnvor of broad 



tires 22.7 " 



