Scientific American Supplement, No. 421, January 26, 1884
Scientific American Supplement, No. 421, January 26, 1884
Various
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In NewYork the iron soilpipe, with joints made with lead, is now required bythe municipal regulations. It is a stronger pipe than a rainwaterpipe. The latter will often be found to have holes. A lead jointcannot be made properly in a weak pipe, therefore the lead joint is tosome extent a guarantee of soundness. Lead pipes will be eaten away bywater containing free oxygen without carbonic acid, therefore purerainwater injures lead pipes. An excess of carbonic acid in water willalso eat away lead.... You will find that in many cases pinholes appearin a soilpipe, and when inside a house that allows sewer gas to passinto the house. Moreover, lead is a soft material; it is subject toindentations, to injury from nails, to sagging. A cast-iron pipe, whencoated with sewage matter, does not appear to be subject to decay; andif of sufficient substance it is not liable to injury. When once wellfixed, it has no tendency to move. I would, therefore, advocate castiron in lieu of lead soilpipes. In fixing the soilpipe which is toreceive a water-closet, the trap should form part of the fixed pipe;so that if there is any sinking the down pipe will not sink away fromthe trap.
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