. The sanitary news : healthy homes and healthy living : a weekly journal of sanitary science. Fie. 6. Sept. 4, 1886.] THE SANITARY NEWS. 229 I think them perfectly safe to use withoutventing, as shown in house figures 5 and 6, be-cause the heavy ball valve, while it wedges butvery slightly, and may often be raised for an in-stant from its seat by strong siphonage from thedischarge of other fixtures, nevertheless mustinstantly cork its inlet certainly and surely be-cause of its considerable weight. It is, in effect,a check valve, allowing ingress of air underpressure to the waste pipe, but sur
. The sanitary news : healthy homes and healthy living : a weekly journal of sanitary science. Fie. 6. Sept. 4, 1886.] THE SANITARY NEWS. 229 I think them perfectly safe to use withoutventing, as shown in house figures 5 and 6, be-cause the heavy ball valve, while it wedges butvery slightly, and may often be raised for an in-stant from its seat by strong siphonage from thedischarge of other fixtures, nevertheless mustinstantly cork its inlet certainly and surely be-cause of its considerable weight. It is, in effect,a check valve, allowing ingress of air underpressure to the waste pipe, but surely closing to. Fig. 7- Showing ball in its seat and air currents induced in systemshown in House Fig. 7. outward pressure. Why this trap should dothis effectively, may perhaps be understood onnoticing the facts, again repeated. First.—There is no enlargement of the water-way of the trap, and consequently no loss offorce in the sewage discharge to move the ballquickly and to scour out the trap, and there isno sediment chamber. Second.—The ball seats itselj with muchcelerity and precision and holds a deep waterseal.
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