British Architect Volume . 51

British Architect Volume . 51

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1899 edition. Excerpt: ...of apparatus coming under this category show considerable mechanical ingenuity, and installations upon a large scale are noteworthy for the magnitude of their output as compared with the limited space required. Amongst filters of this kind may be specially mentioned the "Riddell," the "Torrent," the "Howatson," and the "Wilson" filters. These have all been applied for public purposes, and in installations capable of dealing with from 1,5oo, ooo to 2,6oo, ooo gallons of water per 24 hours, Various ingenious contrivances for cleansing are generally used in addition to reverse currents of water. The Riddell filter has an arrangement of radial arms, which are moved up and down, as well as in a rotary manner, by hydraulic power. In the Torrent filter compressed air is employed, and in the Wilson apparatus a very ingenious automatic flushing system is adopted. Mr. Twelvetrees next drew attention to the example of waterworks filtration by the Pasteur method, as used at Darjiling. The output is about 25o, ooo gallons daily, and as the Pasteur filtration employs the only known absolutely germ-proof medium, the installation in question may be regarded as unique. Another mode of water purification is that patented by Anderson in 1889, where water is agitated in revolving drums containing fragments of metallic iron. Some of the iron is dissolved, and as the water passes from the apparatus to settling tanks it is aerated. Oxide of iron thus formed carried down impurities by deposition. Sterilisation by heat at a temperature of 24o degrees Fahr. affords perfect immunity from pathogenic bacteria, and an apparatus known as the VaillardDesmaroux Heat Steriliser was described and illustrated. This form of appliance has...
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Product details

  • Paperback | 340 pages
  • 189 x 246 x 18mm | 608g
  • United States
  • English
  • black & white illustrations
  • 1236841751
  • 9781236841759