Practical sanitation; a handbook for sanitary inspectors and others;with apxon Sanitary law, by Herbert Manley . drain being cleared beyond the trap, should be used. In thiscase the inlet for ventilation is pro-vided by means of openings in themanhole cover, or if, by reason of itsposition, there is an objection to this,by a special opening at the side, shownby dotted lines, which is carried upsome distance above the ground level. Fig. 39 represeuts an improvedtrap introduced by the late ProfessorCorfield; the syphon is egg-shapedin section and curtailed in calibre; SECTION rfT , the rak
Practical sanitation; a handbook for sanitary inspectors and others;with apxon Sanitary law, by Herbert Manley . drain being cleared beyond the trap, should be used. In thiscase the inlet for ventilation is pro-vided by means of openings in themanhole cover, or if, by reason of itsposition, there is an objection to this,by a special opening at the side, shownby dotted lines, which is carried upsome distance above the ground level. Fig. 39 represeuts an improvedtrap introduced by the late ProfessorCorfield; the syphon is egg-shapedin section and curtailed in calibre; SECTION rfT , the raking-arm has a secondinlet which is sealed by a movableplug with chain attached. This trapis more likely to be self-cleans-ing, but should it become obstructed,as may sometimes happen, thesewage which in consequence wouldcollect in the manhole would beliberated by pulling the chain; without this contrivance itwould be necessary to empty the manhole by means of a pumpor with buckets before any one could enter it to unstop question of the necessity for trapping a drain before it 0 SECTION /IT /7. O. 88 PRACTICAL SANITATION. joins the sewer is at present the subject of discussion amongsanitary engineers. While some maintain that it is desirableto adhere to the practice hitherto observed, others advocate thefree connection. Undoubtedly the introduction of a trap in the course of adrain has the effect of interfering to a certain extent, with thefree flow of the sewage, and tends occasionally to cause obstruc-tion; therefore, if it can be shown that the practice is unnecessaryit ought unquestionably to be discontinued. By establishing a free communication between the drains andsewers, the various soil-pipe ventilators, and the ventilatorsplaced at the top ends of drains, would act as outlets for sewerair, the inlets being the open manhole covers in the this means the circulation of air in the sewers would beencouraged, and one would hear less frequently of nuisa
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectsanitat, bookyear1904
