684 Rqwrt on the Trials of Implements at Bedford.' 



o feet 5 inches diameter, as compared with 58*7 lbs on the hind 

 wheels of 5 feet diameter, which difference is 40 per cent. 

 This sufficiently proves that the diameter of the wheels has 

 much influence upon the draught of any cart or waggon. 



Now, by referring to the following Table, it will be seen what 

 effect inclination of ivheels has on the draught. Here Nos. 4875, 

 1431, 1306, and 1567 in Class XX. are compared — 



Inclination of Front wheels 



Ditto Hind wheels 



Mean Draught per Ton gross load on macada- 

 mised road 



Ditto per Ton gross load on Field course 



Width of tyre 



In looking at the inclination of the wheels it will be observed^ 

 in the trial upon the road, that where the angle of inclination is 

 smallest, there is the lowest mean draught ; and it will be as 

 well to compare simply the draught on the road, because it was 

 found that on the field course the draught was greatly influenced 

 by other causes, such as, for instance, the broader tyre in No. 

 1567. Of course these results must only be compared in a 

 general way, for there are so many even unnoticed causes by 

 which the draught of any waggon is influenced. 



In order to notice the effect of icidth of tyre, I may again 

 refer to the last Table and there compare No. 4875, T. Milford 

 and Son, with No. 1567, W. Glover and Sons. The width of tyre 

 in the former is 2^ inches, and in the latter 4 inches, and, owing 

 to the smaller degree of inclination in the wheels of No. 4875, 

 the draught on the road is considerably less in this one than in 

 No. 1567 ; but it must also be noticed that although the wider 

 tyre in Glover's waggon no doubt has a certain effect in re- 

 ducing the draught on the road, especially if the road is in any 

 way soft or damp, still this is here less noticeable than on the 

 arable land, where the figures are reversed, Milford's waggon 

 having a draught of 205 lbs. and Glover's one of only 189 lbs. 

 This difference must be entirely due to the greater width of tyre, 

 which to some extent keeps the wheels from sinking in the 

 soft ground, and thereby reduces the draught. 



The next point to be noticed is the effect of form of tyre, and 

 this will be best seen by comparing W. Ball and Son's waggon. 

 No. 1308, with F. P. Milford's, No. 5038, both in Class XXIL 



