Remarks on the Present System of Road Making: With Observations, Deduced from Practice and Experience, With a View to a Revision of the Existing Laws, and the Introduction of Improvement in the Method of Making, Repairing, and Preserving Roads, and Defending the Road Funds from Misapplication. Seventh Edition, Carefully Revised, With an Appendix, and Report from the Select Committee of the House of Commons, June 1823, with Extracts from the EvidenceMcAdam, John Loudon
History
Remarks on the Present System of Road Making: With Observations, Deduced from Practice and Experience, With a View to a Revision of the Existing Laws, and the Introduction of Improvement in the Method of Making, Repairing, and Preserving Roads, and Defending the Road Funds from Misapplication. Seventh Edition, Carefully Revised, With an Appendix, and Report from the Select Committee of the House of Commons, June 1823, with Extracts from the Evidence
McAdam, John Loudon
Macadam roads; Roads -- Great Britain
Does the plan which you have mentioned of breaking up the roads, apply
to gravel roads, or only to those roads composed of hard stones?—In
gravel roads and in some other roads it would be impossible to break
them up to any advantage; and in several places which I will explain, I
should think it unprofitable to lift a road at all. There is a
discretion of the surveyor, or the person who has the execution of the
work, which must be exercised. I did not order the road in the
neighbourhood of Reading to be lifted, but I directed wherever a large
piece of flint was seen, it should be taken up, broken, and put down
again; and I directed the road to be made perfectly clean—I am speaking
of a gravel road now—and I directed that additional gravel should be
prepared in the pits by screening the dirt very clean from it, breaking
all the large pieces and bringing that upon the road in very light coats
not exceeding two inches at a time; and when those coats were settled,
to bring others of very clean materials upon the road, until it settled
into a solid smooth hard surface, and which the coachmen in their mode
of expression, say “runs true.” The wheel runs hard upon it; it runs
upon the nail.
Uninfluenced by the state of the weather?—Perfectly so.
In your experience, have you observed that on gravel roads the materials
are generally very unskilfully and improperly applied?—Generally so. I
think always I may say, for I think I never saw them skilfully or
properly managed.
Have you adopted the mode of washing the gravel?—No; I think that is a
more expensive process than is necessary.
Do you think it more expensive than screening?—A great deal more so, and
I have another reason for objecting to that, with respect to the gravel
near London; the loam adheres so strongly to it that no ordinary washing
will clean it. The loam is detached from the gravel by the united effort
of the water on the road, and the travelling, by which the roads near
London become so excessively dirty; but it would be impossible to detach
the loam from the gravel in the pits, by throwing water on it; I have
tried the experiment and know the fact.
To what particular practice do you allude, when you inform the Committee
that gravel is unskilfully applied to the roads in general?—I see that
on gravel roads, the gravel is put on after being very imperfectly
sifted, and the huge pieces not being broken, and the gravel is laid on
the middle of the road and allowed to find its own may to the sides. Now
the principle of road-making I think the most valuable, is to put broken
stone upon a road, which shall unite by its own angles, so as to form a
solid hard surface, and therefore it follows, that when that material is
laid upon the road, it must remain in the situation in which it is
placed without ever being moved again; and what I find fault with
putting quantities of gravel on the road is, that before it becomes
useful it must move its situation and be in constant motion.
Public-domain text, read in full here on John Shaqi.
Reviews
Reviews
No reviews yet
Be the first to share your thoughts on this work.
Elsewhere in the archive
Join the Discussion
Join the discussion
Sign in to leave a comment or review.
Sign InorCreate an account