Practical sanitation; a handbook for sanitary inspectors and others;with apxon Sanitary law, by Herbert Manley . to theflow of sewage in the drain, they tend to cause stoppage, and for thisreason ready means of access to them should be provided (see p. 82). Automatic flush-tanks are excellent contrivances, by meansof which drains and sewers may be regularly flushed, a proceedingwhich under all circumstances is desirable and often and sewers ought to be laid with a sufficient fall to beself-cleansing under the conditions of an ordinary flow of sewage,but this is not always poss
Practical sanitation; a handbook for sanitary inspectors and others;with apxon Sanitary law, by Herbert Manley . to theflow of sewage in the drain, they tend to cause stoppage, and for thisreason ready means of access to them should be provided (see p. 82). Automatic flush-tanks are excellent contrivances, by meansof which drains and sewers may be regularly flushed, a proceedingwhich under all circumstances is desirable and often and sewers ought to be laid with a sufficient fall to beself-cleansing under the conditions of an ordinary flow of sewage,but this is not always possible, in which case the flow must beperiodically supplemented by some other means. Fields flush-tank, shown in section (Fig. 49), has beendesigned for this purpose, and answers admirably. It may be SANITARY AND INSANITARY WORK AND APPLIANCES. 95 constructed to hold any quantity of water, in accordance withthe size of the drain or sewer which it is intended to flush, thediameter of the outlet being regulated accordingly. Tanks ofthis description which are connected with large sewers are mostly jj __P JSP™. Fig. 49. Fig. 50. built in brickwork, but those for drains and smaller sewers areusually made of galvanised wrought iron. In the case of privatedrains, the usual capacity of such a tank is from 80 to 100gallons, the diameter of the discharge-pipe being 4 inches. Theautomatic discharge is accomplished by means of the syphonarrangement in the interior. Passing through the floor of thetank is a pipe which is open at both ends; the lower end termi-nates in a chamber underneath, containing water into which itdips, and in the interior it is surrounded by a cap which doesnot reach quite to the bottom of the tank. This constitutes thesyphon. A tap is connected with the tank, and the flow ofwater is regulated in accordance with the length of interval it isintended should elapse between each discharge. The syphonaction is started in the following manner :—As the tank fills, thewater
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectsanitat, bookyear1904
