106 “Experiments on the Draught of Carriages. [Aue. 
repeating at present, as | have not extended my experiments on 
them sufficiently. 
If what 1 have stated should be sufficiently interesting, and at 
the same time compatible with the nature of your publication, | will 
thank you to give it an insertion. 
Philadelphia, July 21, 1814. 
Articue III. 
Experiments on the Draught © Carriages. 
By R. L. Edgeworth, Esq. 
Mr. Bryan presented the following Report from the Committee of 
Mechanics and Natural Philosophy of the Dublin Society :— 
Report of the Committee of Mechanics and Natural Philosophy of 
the Dublin Society. 
On Saturday, the 22d of April, Hee Committee attended in the 
yard of Leinster House, when the following experiments were pub- 
licly made by Mr. Edgeworth :— 
Experiment I. 
Two furniture carts were placed at one end of the yard, which 
was paved in the ordinary manner, They were both constructed 
upon grasshopper springs; one of them was painted yellow, the 
other green. : 
These carriages were pulled forward by the apparatus invented by 
Mr. Edgeworth, which consists of a two-wheeled carriage, drawn 
by one or two horses, upon which a wheel or pully, of nearly eight 
feet diameter, is so placed as to turn freely in an horizontal direc- 
tion. A rope, passing round this wheel or pulley, is attached by its 
ends to the carriages that are to be compared ; and, as the apparatus 
is drawn forward, the two carriages must follow, and that which 
s the easiest will get foremost. 
This apparatus was drawn at a moderate pace by two horses, and, 
that carriage which ran the lightest and easiest was loaded till the 
other kept pace with it. 
‘Five ewt. was then placed upon each. 
The springs of the yellow carriage were prevented from acting by 
blocks of wood interposed between the springs and the body of the 
carriage. The green carriage, the springs of which were allowed 
to act, was now loaded with 14 cwt. additional weight, making a 
tora! of 61 ewt.; and the green carriage so loaded was found to get, 
before the yellow carriage, the weight on which amounted to only, 
5 cwt. "y 
" By this experiment it appeared that the carriage upon springs had. 
