Nf. 6. DEPARTMENT OF AGRICULTURE. , 9^7 



Average draft. 



Narrow tires, 317.3 pounds. 



Broad tires, 228.8 



Difference in favor of broad tires, 88.5 " 



Percentage difference, 38.6 



(b) Timoth}' sod. Soft. Surface frozen, but not enough to bear 

 up the wagons. Length of run 400 feet. 



Trial made February 8, 1896. 



Average draft. 



Narrow tires, 563 .2 pounds. 



Broad tires, 461.1 " 



Difference in favor of broad tires, 102.1 " 



Percentage difference, 22.1 



(c) Timothy sod. Grass and stubble about 3 inches high. Ground 

 soft and spongy. Narrow wheels cut ruts 5 to 6 inches deep. Broad 

 tires made ruts 1^ to 2 inches deep, doing almost no damage. 

 Length of run, 400 feet. 



Trial made April 9, 1896. 



Average draft. 



Narrow tires, 569 . 1 pounds. 



Broad tires, 323.6 " 



Difference in favor of broad tires, 272.5 " 



Percentage difference, 84 



(d) Timothy sod, same as ''(c)." Each set of wheels was run in its 

 own track twelve times before reading was taken. Rut cut by nar- 

 row tire 12 to 15 inches; by broad tire, 4 to 5 inches. Length of run, 

 400 feet. 



Trial made April 9, 1896. 



Average draft. 



Narrow tires, 876 pounds. 



Broad tires, 397.9 " 



Difference in favor of broad tires, 478.1 " 



Percentage difference, 120 



(e) Timothy sod, moist but reasonably firm. Narrow tire cut rut 

 3^ inches deep, broad tire made rut from ^ of an inch to one inch 

 deep; length of run, 400 feet. Trial made March 19, 1897. 



Average draft. 



Narrow tires, 420 . 8 pounds. 



Broad tires, 305 " 



Difference in favor of broad tires, 115.8 " 



Percentage difference, 38.0 



V. Pasture Land. 



(a) Bluegrass sod; smooth, dry, firm. Neither set of wheels cut an 

 appreciable rut. Trial made September 12, 1896. Length of run, 

 400 feet. 



