990 



ANNUAL REPORT OF THE 



Off. Dor. 



Average draft. 



Broad tire, 308. pounds. 



Narrow tire, 206.1 



Difference in favor of narrow tire, .... -101.1) " 

 Percentage difference in favor of narrow 



tire, 49.4 



(f) Muddy on top, firm underneath. Mud about 2^ inches deep, 

 very sticlvy, adhering to the broad wheels. Soft enough to allow the 

 narrow tires to cut through to solid ground with slight resistance. 

 Trial made October 12, 1896. Length of run, 400 feet. 



Average draft. 



Narrow tires, 250.8 pounds. 



Broad tires, 32.5.3 " 



Difference in favor of narrow tires, 74.5 " 



Percentage difference in favor of narrow 



tires, 29.7 



(g) Clay road. Surface soft to a depth of 3 or 4 inches. Ruts cut 

 by narrow tires in ordinary use of the road 5 to 6 inches deep with 

 fairly firm bottom. Walls of ruts more or less soft and sticky. The 

 narrow tired wheels were run in these ruts 4 times without apprecia- 

 bly deepening them. The broad tired wheels were run over the ruts 

 forming a new rut 6 inches wide and about 3^ inches deep in the soft 

 clay on the surface. Trial made January 16, 1897. 



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It will be observed that in the second run of the broad tired 

 wheels in their own rut the draft was materially reduced, the dif- 

 ference between the broad and narrow tires being but 52.0 pounds, 

 or 15.8 per cent, as compared with a difference of 150.7 pounds, or 

 44.3 per cent, in the first run. The average draft of the broad tires 

 was: 



1st Run, lbs. 2d Run, lbs. 



Going, 560.8 384.0 



Returning 420.8 380.0 



Average, 490.8 382.0 



