5
Horses' feet drawing 60 44.5
Total injury 100 100
Supposing it, therefore, to be ascertained that the wheels of
steam carriages do no more injury to roads than other carriages
of equal weight travelling with the same velocity, the committee
now possessed the means of approximating to a just rate of toll
for steam carriages.(1*)
302. As connected with this subject, and as affording most
valuable information upon points in which, previous to
experiment, widely different opinions have been entertained; the
following extract is inserted from Mr Telford's Report on the
State of the Holyhead and Liverpool Roads. The instrument
employed for the comparison was invented by Mr Macneill; and the
road between London and Shrewsbury was selected for the place of
experiment.
The general results, when a waggon weighing 21 cwt was used
on different sorts of roads, are as follows:
lbs
1. On well-made pavement, the draught is 33
2. On a broken stone surface, or old flint road 65
3. On a gravel road 147
4. On a broken stone road, upon a rough pavement foundation 46
5.
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