. Sanitary engineering : a guide to the construction of works of sewerage and house drainage, with tables for facilitating the calculations of the engineer. which has alreadybeen referred to at page 408, consists in the fall givento the water when entering the trap. In Fig. 159 is shown an arrangement of trap whichthe author designed, and is using experimentally in thehouse-drain of his residence at Croydon. This trap,which was inserted with a view to experiment and totest the efficiency of the system, was manufactured byMessrs. Henry Doulton and Co., of Lambeth, and has beenin operation for o
. Sanitary engineering : a guide to the construction of works of sewerage and house drainage, with tables for facilitating the calculations of the engineer. which has alreadybeen referred to at page 408, consists in the fall givento the water when entering the trap. In Fig. 159 is shown an arrangement of trap whichthe author designed, and is using experimentally in thehouse-drain of his residence at Croydon. This trap,which was inserted with a view to experiment and totest the efficiency of the system, was manufactured byMessrs. Henry Doulton and Co., of Lambeth, and has beenin operation for over two years, and has so far answeredperfectly. In this trap there is an abrupt fall of6 inches from the house-drain into the trap. Provisionis also made for the admittance of air on the house sideof the trap, and for ventilation, where necessary, on thesewer side of the trap. The trap in this case is formedby a thin diaphragm not more than 1 inch in thickness, HOUSE DRAINAGE. 501 so that the distance for any matter to travel is reducedto the shortest possible space, and the abrupt fallinto the trap will secure any floating substance being Fig. &°r?ih?^ driven by the water under the diaphragm forming thetrap. The difficulty in using traps of this description Difficulty ofin existing drains, arises from the fact that few house- ^existi^g1^drains have sufficient fall to enable a trap of this kind be inserted. Fig. 160 is a representation of Potts Patent Potts patentEdinburgh Air-chambered Sewer Trap, which isdescribed by its inventor as follows : A represents anair chamber 2 feet 6 inches or 3 feet long; B is the soilpipe from the closet. The arrows show the courseof the soil through the trap. D is an ordinary watertrap or syphon, E E an open grating raised two or 2 L trap. 502 HOUSE DBAINAGE. three inches above the ground level, having a secondgrating or tray below it on which charcoal or otherdisinfectants may be placed. F is a ventilating pipe ; Fig. 16
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