Iron versus Lead Pipes. tively belong but there is no question there is not much choice left between them. Under certain circumstances and conditions which vary with the locality they are both to be feared as mediums for the conveyance of water as well as gas. Let us consider the case of iron pipes first and investigate some of the objects urged against their use as the whole sub ject is one of the most serious importance to the public at large. It is alleged that iron pipes are porous allowing their contents to escape or literally to permeate through the mole cular intetstices of the material
Iron versus Lead Pipes. tively belong but there is no question there is not much choice left between them. Under certain circumstances and conditions which vary with the locality they are both to be feared as mediums for the conveyance of water as well as gas. Let us consider the case of iron pipes first and investigate some of the objects urged against their use as the whole sub ject is one of the most serious importance to the public at large. It is alleged that iron pipes are porous allowing their contents to escape or literally to permeate through the mole cular intetstices of the material; that moreover they leak considerably at the joints speedily corrode and decay especial certain descriptions of water which is to be utilised for pota An obvious distinction must be made between the escape absolute permeation does take place is incontestable ; equal ly so with leakage. When iron pipes are fresh laid with new joints in a perfectly hermetically tight condition so that no direct leakage can take place the ground in the vicinity nevertheless becomes in a very short time complete ly saturated with gas. Again where gas pipes have been the escape of their contents. But a still more remarkable circumstance has been observed at Croydon and elsewhere. When iron pipes some containing gas and the others water cape from the one pipe and permeate through the other un-. til it mixed with the water in it. Extraordinary as this oc currence may appear it is readily explained in accordance with the chemical theory of the subtle diffusion of gases. It caped from its own confinement impregnates the ground lying about the pipes and thus we have the pipe containing the a porous medium between two fluids of different densities and by virtue of the chemical law already alluded t they will tend to become intermixed with a force inversely proportion al to their respective specific gravities. The remedy for may be effected either by the employment of another materi al or by coating the i
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