A manual of hygiene and sanitation . Grease trap. (Habkington.) pipe above the entrance of the waste-pipe from the highestfixture, or be continued separately into the out-door air.(See Fig. 59.) But this greatly increases the expense, and,as the vent-pipes, to be efficient, must be almost two inchesin diameter, they also favor evaporation from the the trap is properly constructed, if the soil-pipe is ofsuitable size and height, and if the fixtures be placedas near the soil-pipe as possible, there will be but little A NTT-SIPHONING A TTA CHMENT. 377 danger of siphonage occurring. Where
A manual of hygiene and sanitation . Grease trap. (Habkington.) pipe above the entrance of the waste-pipe from the highestfixture, or be continued separately into the out-door air.(See Fig. 59.) But this greatly increases the expense, and,as the vent-pipes, to be efficient, must be almost two inchesin diameter, they also favor evaporation from the the trap is properly constructed, if the soil-pipe is ofsuitable size and height, and if the fixtures be placedas near the soil-pipe as possible, there will be but little A NTT-SIPHONING A TTA CHMENT. 377 danger of siphonage occurring. Where it does occur,McClellans anti-siphon attachment (Fig. 69) is said towork advantageously, being inexpensive and permittinga free ingress of air to the trap, but no egress of air fromthe soil-pipe into the house. In this device a smallweighted and inverted cup rests with its edge immersedin a ring of mercury, from which it is raised by the Fig. McClellans anti-siphon attachment. Sectional view of vent with cup liftedout of the mercury by the inflowing current of air, indicated by the arrows. (ROH]&.) atmospheric pressure only when the siphonage sufficientlyreduces the pressure within the pipes. The mercury andthe weight of the cup make a seal sufficient to preventany outflow of gas. It is also said that if the waste-pipe be connected with the soil-pipe by a divergent open-ing, siphonage will be less likely to occur. All waste-pipes, soil-pipes, and house-drains should be 378 THE REMOVAL AND DISPOSAL OF SEWAGE. tested before use by closing all openings and forcing inair to a pressure of at least thirty pounds to the square
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Keywords: ., bookcentury1900, bookdecade1900, booksubjecthygiene, bookyear1903
