Mechanical Contracting & Plumbing January-December 1908 . ver. and the system just described is merelya most convenient and sanitary way ofautomatically accomplishing that ver\-desirable result, with the accompanyingadvantage of not only depositing it inthe earth partially treated, but in amuch more favorable condition to re-ceive final treatment than could possiblyobtain if the former method were adopt-ed. Disposal of Effluent. Anticipating the difficulty which willbe encountered where there is a consid-erable full in the ground surroundingthe building to be drained, refer to Fig. which shows
Mechanical Contracting & Plumbing January-December 1908 . ver. and the system just described is merelya most convenient and sanitary way ofautomatically accomplishing that ver\-desirable result, with the accompanyingadvantage of not only depositing it inthe earth partially treated, but in amuch more favorable condition to re-ceive final treatment than could possiblyobtain if the former method were adopt-ed. Disposal of Effluent. Anticipating the difficulty which willbe encountered where there is a consid-erable full in the ground surroundingthe building to be drained, refer to Fig. which shows a number of terraceseach receiving a portion of the effluentfrom the tank. It will be noticed thatthe end of the glazed tile is turned up afew inches on the brow of each terrace,the obvious result of which is that allthe field tiles at that level must fill be-fore the sewage can rise and overflow tothe tiles on the next lower level, wheretlie same operation takes place, and soon for any number of terraces, and aswill be apparent, the sewage passing in-. Fig. 3. ? not placed closer together than twofeet in light soil, and a somewhat great-er distance in heavy soil. The field tile should not be placedmore than one foot below the surface,and must be perfectly level, for the rea-son that if given a fall the earth sur-rounding the low ends of the systemwould receive more than its share ofliquid sewage, and might in time be-come fouled. While if level, the earthsurrounding every tile has an equalamount of work to do, and will producemost satisfactory results* The operation of the system is asfollows : The sewage from the buildingenters through soil pipe E, filling thefirst compartment in which all solidmatter is retained until it is reduced bythe contained bacteria which multiplyand develop very rapidly. In a liquidform it is allowed to enter the secondcompartment through overflow F,which is turned down because of thepresence of the bulk of the organic mat- Fig. 4. Size of Tank. In
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