. A domestic cyclopædia of practical information ... drain by regular flushing or by theuse of a wire, or in whatever way may seembest, and all danger of the leaching away into thesoil near the house or well, of the contents ofthis drain being avoided, our next attentionshould be given to the disinfecting of the air ofthe drain itself, and to preventing the ingressof this air into the house. The great disin-fectant under all such circumstances is com-mon air, and there is no way in which we cannearly so well secure ourselves against theproduction of dangerous gases in a drain asby the establis
. A domestic cyclopædia of practical information ... drain by regular flushing or by theuse of a wire, or in whatever way may seembest, and all danger of the leaching away into thesoil near the house or well, of the contents ofthis drain being avoided, our next attentionshould be given to the disinfecting of the air ofthe drain itself, and to preventing the ingressof this air into the house. The great disin-fectant under all such circumstances is com-mon air, and there is no way in which we cannearly so well secure ourselves against theproduction of dangerous gases in a drain asby the establishment of a free current of airf^^jiwithin it. ^ In this work, as in almost everything else,the simplest way is the best. When the drainruns only from the kitchen sink, then a separ-ate air pipe should be carried from its houseend well above the top of the house, (not nearto the top of a chimney nor to a window), andbe furnished at its upper end with a ventilatingcovvl that will tend to keep up a good should be some means for admitting. ySiuiw Fig. D. and ua trap of any sort should be used in itscourse, but the soil pipe should be continuedof its full size out thrpugh the top of the house(See Fig. D) and be furnished with a ventilat-ing cowl. There will then be no trap in thecourse of the pipe to arrest solid matters and 168 DRAINAGE DREDGING hold them for decomposition, and there will bea steady current of fresh air sufficient to preventthe/ti/j-o«()«j-decomposition of the refuse mattercontained in the pipe or drain,—which if de-prived of sufficient air would enter into a putre-faction that would be likely to evolve dangerousgases. The supply of air to the lower end ofthe drain may come from the sewer or from thecistern, if these are luetlventilated. If there is NOsufficient ventilation of these, then there shouldbe a trap near the lower end of the drain, andan inlet for fresh air into the drain above cold climates, this inlet should be by a smallpipe (
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