94 Report of the Committee of the Dublin Society 



On the On the 

 wooden road, iron road. 

 A carriage with straight axletree, was\ ,„„ , \\\w^ 

 drawn by . . . . . . , . j ' ■' 



Ditto, patent axletree, .. L'ilbs. — 11 lbs. 



Ditto, Messrs. Bournes' axletree 21 lbs. — 12 lbs. 



N. B. Messrs. Bournes' wheels were of the kind called double- 

 dished. 



Comparison of the Modes of Greasing. 



The patent and straight axletrees being brought to an equality 

 of draught, when drawn forward by the peirameter, and grease 

 being substituted for anti-attrition composition on the straight 

 axletree, the patent, though loaded with two quarters of a hun- 

 dred more, preceded the straight. 



Your committee cannot vouch for the accuracy of this experi- 

 ment, on account of the pressure of the crowd. 



On the Effect of bendirig the Arm of the Axle downwards^ 

 so as to produce what is termed a Creep. 



A two-wheeled carriage with the axle bent downwards, was 

 drawn on iron by 14 lbs. ; on wood by 14 lbs. or 14irb5'. 

 The axle of this carriage was so altered as that the horizontal 

 gather in front was four inches and a half, and the points of the 

 circumference, of the Avheels in front, nearest to each other, 

 were six inches above the road. The carriage was then juit 

 drawn on wood by 26 lbs. 3 on iron by 20 lbs. 



On the Effects of Springs on Tivo-wheeled Carriages. 



Two carriages of equal weight and similar construction, wcrf 

 tried by the peirameter, one having grasshopper springs, tl; 

 other without, springs; that with springs carrying 8 cwt. 2 qr:., 

 preceded the one without springs, carrying 4 cwt. 2 qrs. 7 lbs. 



The same carriages were again compared, substituting ellipti': 

 for grasshopper springs ; 2 qrs. 7 lbs. being added to the carriag*: 

 without springs ; when the springs were prevented from actings 

 the carriages kept together ; the springs being permitted to act, 

 there were added to the carriage with springs, 2 cwt. Iqr. — thcv 

 then kept together; on 2 qrs. being added to the carriage witti 

 -»^prings, it preceded 3 the springs being by this brought mort 

 perfectly into play. 



Comparison of wooden tvith steel Springs. 



cwt. qrs. Ibf. 

 A carriage with wooden springs, carrying . , 3:3:0 

 A carriage without springs . . . . ..2:2:7 



were 



