together, andunlike most drains composed of brickwork, it is practi-cally imperishable; great care will, however, be requiredin jointing. There are two pipes with which it would be well tobe conversant. One is the combined drain-pipe andsubsoil-pipe of Huddersfield, sketched at fig. 21. Thissystem… … Bedding of Dram-pipes. 21 used in flushing the drain-pipes above. The otherpipe, which is drawn at fig. 22, is the only method ex-tant for carrying sewage through water or across ariver, and shutting out such sewage from the purer 21 22
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