Van Nostrand's engineering magazine . p, Garlands trap, Buchanstrap, Warings check valve, Nicholsonsmercury seal trap, and others (see Fig. 2-) The bell trap A is objectionable on ac-count of insufficient water seal and im-proper shape. It is frequently found atthe outlet of sinks and yard gullies, andbeing in its upper part a movable strainer,it is often lifted by servants or thought-less persons, and the gases from thedrain pipe thus enter the house freely. Antills trap B avoids this defect, hav-ing a fixed strainer, but is objectionableon account of shape and small water-seal. The D-trap C
Van Nostrand's engineering magazine . p, Garlands trap, Buchanstrap, Warings check valve, Nicholsonsmercury seal trap, and others (see Fig. 2-) The bell trap A is objectionable on ac-count of insufficient water seal and im-proper shape. It is frequently found atthe outlet of sinks and yard gullies, andbeing in its upper part a movable strainer,it is often lifted by servants or thought-less persons, and the gases from thedrain pipe thus enter the house freely. Antills trap B avoids this defect, hav-ing a fixed strainer, but is objectionableon account of shape and small water-seal. The D-trap C and the bottle trap Dconstitute small cesspools ; they violatethe principle tha£ a trap ought to be self-cleansing. The D-trap accumulates dirtand grease in the upper corner, whichreceives no scouring from the water pass-ing through the trap; and the bottletrap very often chokes up as shown at round trap of improved shape is shownat F, which may keep cleaner on accountof its round bottom. 398 VAN NOSTEAND7S ENGINEERING EOUSE DRAINAGE AM) SANITARY PUMHING. 399 Adees trap G is little better in thisrespect, though it has this to recommendit that it is not so easily siphoned, havinga large air space above the water, and a largo body of water in 1 he trap. This isalso true of the round trap, when newand clean ; when choked with grease asshown at E. it is as much liable to siphon-age as the S trap. The Climax trap, H,has a large dip anda round cup at its bottom, which is re-movable for cleaning purposes. Its re-sistance to siphonage is not greater thanthat of any of the other traps, or that o\the common S-trap with same depth ofwater seal. The P-trap I, and Strap J, are shapedso as to be perfectly self-cleansing whenadapted in size to their waste are of uniform diameter through-out, have no nooks or corners to accum-ulate dirt. The old hand-made S-trapswith seams have been superseded bylead traps cast in a mould such as theDa Bois traps. As regards cleanlin
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectenginee, bookyear1879
