This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1904 Excerpt: …an ordinary gully in the area. The grease trap is supposed to be cleaned out once a week, but in order to avoid the smell which it causes it ought to be cleaned out about twice a day. The most extraordinary thing, however, is, even supposing the grease trap is necessary, that it should be fixed inside the scullery, when it could easily have been placed outside the house, in the place of the gully in the area, where its offensiveness would not be so dangerous and noticeable. My own opinion, which has been confirmed by considerable experience, is that, at any rate in small houses, particularly where the cleaning out is likely to be neglected, the grease-accumulating trap is a mistake, v If a flushing gully can be fixed, all well and good; but if not, a self-cleansing gully, as already described in connection with bath and lavatory waste pipes, is the proper thing to use. In such a case as Fig. 154, therefore, the grease trap should be entirely dispensed with, the waste pipe fitted with a self-cleansing form of trap and continued through the external wall, and arranged to discharge below the grating of a round pipe form of gully trap in the manner shown at Fig. 155; and as the waste pipe in this case is considerably more than four feet long, it should be ventilated by an air pipe taken through the external wall as shown–not that syphonage is likely to take place where the trap is connected to a sink of this kind, but on the principle that all dirty pipes should have a current of air passing through them from and to the open air. An important point also is–as in the case of the other fittings before described–that the outlet of the sink should be at least equal in area to the bore of the trap and waste pipe; and it is better still to have the waste grating n…