. A manual of practical hygiene. Fig. 89.—Plan. is a midfeather-trap with an air-shaft on each side the partition; on oneside the shaft ventilates the pipe leading to thesewer, on the other allows fresh ah- to pass intothe house pipe. This second shaft also allowsthe trap to be cleaned. Rain-water pipes are sometimes used toventilate drains, but independent of their smallsize, which often leads to blockage, they are

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Keywords: ., bookcentury1800, bookdecade1880, booksubjecthygiene, bookyear1883