164 DRAUGHT CH. X 



From the Bedford Experiments on Traction. 



An examination of the Bedford Experiments 

 shows : 1 st, That the draught on the soft field is 

 about 41^ times that on the hard road ; 2nd, that 

 with a wide tire this difference is less ; 3rd, that 

 an increased angle of the wheel to the vertical 

 increases the draught ; 4th, that carts have a 

 lighter draught than wagons, and that the differ- 

 ence is greater than is merely in proportion to the 

 greater size of their wheels ; and 5th, that springs 

 diminish the draught on the road, but not on the 

 field. 



These results agree, substantially, with those 

 obtained from other experiments, but it must be 



