. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. 18*0.] THE CIVIL ENGINEER AND ARCHITECT'S JOURNAL. 191 which were laid before me by Mr. Bold. I think no one can ex- amine the instances he records, of wells at great distances heina; immediately drained by pumping at Green Lane, without being struck by the remarkable facility with which the influence of the pumping is transmitted. If the cases adduced had been tew and partial, one might have hesitated in admitting such easy permea- bility as I believe to exist; but the sympa
. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. 18*0.] THE CIVIL ENGINEER AND ARCHITECT'S JOURNAL. 191 which were laid before me by Mr. Bold. I think no one can ex- amine the instances he records, of wells at great distances heina; immediately drained by pumping at Green Lane, without being struck by the remarkable facility with which the influence of the pumping is transmitted. If the cases adduced had been tew and partial, one might have hesitated in admitting such easy permea- bility as I believe to exist; but the sympathy here evinced is at once so extensive, and the evidence so authentic, as to free my mind from all doubt. It was urged, that the instances alluded to by Mr. Bold were only from shallow wells, and that the effect would not have been produced if they had been deep ones; but these wells cannot be truly stated as all shallow, nearly one half of them being from twenty to thirty-nine yards deep. This, however, does not strike me as of much importance, for if in both cases the easy diffusion, or the migration of water from one part of the formation to the otlier be equally well established, it matters not whether the wells be shallow or deep. My opinion is that, in considering the question of the supply of water, the rock may be looked upon as almost equally permeable in every direction, and the whole mass regarded as a reservoir up to a certain level, to which, whenever wells are sunk, water will always be obtained, more or less abundantly; and a very careful consideration of the facts that have come to my knowledge in the present investigation leads me to consider this view as the simplest and the only one capable of general application. Quantity of Water to be got from Wells. By thus recognising the permeability of the sandstone to a great extent, the question is relieved from many technical difficulties, which have caused much discussion without leading to any practi- cal result
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