Practical sanitation; a handbook for sanitary inspectors and others;with apxon Sanitary law, by Herbert Manley . ight. The gully-trap is now so well-known, even in countrydistricts, that, in the case of new work, it is usually employedin place of the above arrangement of bricks and mortar, stillone occasionally does meet with such an objectionable form oftrap even in new work, and very many may be found in workof an earlier date. The above sketchrepresents this trap as it is met with inthe case of shallow drains, when fre-quently about one-half the area of thesurface is left open, being fitted
Practical sanitation; a handbook for sanitary inspectors and others;with apxon Sanitary law, by Herbert Manley . ight. The gully-trap is now so well-known, even in countrydistricts, that, in the case of new work, it is usually employedin place of the above arrangement of bricks and mortar, stillone occasionally does meet with such an objectionable form oftrap even in new work, and very many may be found in workof an earlier date. The above sketchrepresents this trap as it is met with inthe case of shallow drains, when fre-quently about one-half the area of thesurface is left open, being fitted with agrating to receive the surface drainageof the yard ; not unusually, however,the trap is completely covered, anarrangement which is still more objec-tionable, as the foul deposit which col-lects in it will rarely be removed. Another bad form of trap is theD-trap (Fig. 48). It is usually metwith in connection with soil-pipes,although, now, the syphon-trap has entirely superseded it. Itsdefects are perfectly apparent, there are too many sharp anglesand projection? which prevent its being Fig. 48. 94 PKACTICAL SANITATION. It will be necessary to refer to some of these traps again, inconnection with the details of plumbing; but it will be convenienthere to call attention to certain important conditions with whichall traps must comply in order to effectively fulfil the purpose forwhich they are intended. They must impose a sufficient andconstant barrier or seal against the passage of sewer gas, andthey must be self-cleansing. The first condition necessitates adepth of water-seal of at least lj inches, and the second, theabsence of all angles, projections, or cavities that may interferewith a free flush, and lead to the deposit of solid matter, whichwould immediately decompose and cause a nuisance. _A11 drain-traps, as already stated, must be outside the house, and so con-nected with the drain that in the event of sewer gas forcing its waythrough, it would esca
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectsanitat, bookyear1904
