998 ANNUAL REPORT OF THE Off. Doc. 



Average draft. 



Narrow tires, 195.8 pounds. 



Broad tires, 154 .8 " 



Ditferenee in favor of broad tires, 41.0 " 



Percentage difference, 2G.5 



(b) Bluegrass sod. Dry, firm, smoolli. Xo appreciable impres- 

 sion made bv either set of wheels. Trial made October 13, 189C. 

 Length of run, 400 feet. 



Average draft. 



Narrow tires, 2:59 . 5 pounds. 



Broad tires, 157.0 " 



Difl'erence in favor of broad tires, 82.5 " 



Percentage difference, 52.5 



(c) Bluegrass sod," soft. Depression made by broad wheels about 

 one incb deep. Narrow tires made rut about three inches deep. 

 Length of run, 100 feet. Trial made January IG, 1897. 



Average draft. 



Narrow tires, 437.1 pounds. 



Broad tires, 230.9 



Difference in favor of broad tires, 207 . 2 " 



Percentage difference, :. . . 89.7 



(d) Bluegrass sod, moist but not soft. Rut cut by narrow tires 3 

 inches deep; broad tires rut from -} inch to 1 inch; length of run, 400 

 feet. Trial made March 19, 1897. 



Average draft. 



Narrow tire, 401.5 pounds. 



Broad tire, 316.2 " 



Difference in favor of broad tire, 85.3 "■ 



Percentage difference, 27.0 



(e) Bluegrass sod, moist and somewhat softer than in the preced- 

 ing run. Kut made by narrow tire four inches deep; rut made by 

 broad tire from 1 to 1 inch deep. For about twenty feet in this run 

 the ground was so soft that the broad tire cut a rut from 1 to 2 inches 

 deep. ()]i the same spot the narrow tire rut was from 7 to 8 inches 

 inches deep. Length of run, 400 feet. Trial made March 19, 1897. 



Average draft. 



Narrow tires, 578.5 pounds. 



Broad tires, 436.2 " 



Difference in favor of broad tires 142.3 " 



Percentage difference, 32.6 



As in the case of the mowing lands, five runs were made on blue- 

 grass pastures, covering the different conditions of surface, with 

 the same general result. Tlie same pi-inciph^ holds good here that 

 applies to meadows, and to any surface that is more or less firmly 

 bound togf'thor l)y the roots of grass or weeds, viz: That where the 



