1rtlaaaayaaj

1rtlaaaayaaj

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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. 1912 edition. Excerpt: ...now wasted, in the hope that new knowledge may yet render it profitably available. Numerous instances might be cited in which the tailings from gold mines, the slags from copper smelters, and the dumps from mines and manufactories have become a source of wealth, the wastes of the past being thus converted into the dividends of the present. The dust from stacks and chimneys of all kinds is often not only a great waste of valuable material, but is one of the great evils of modern civilization. Valuable metalliferous dusts are strewn broadcast from the stacks of our smelters; gases and poisonous solids destroy vegetable and animal life; and masses of black smoke pour from our chimneys and settle in clouds over many of our cities, rendering them exceedingly disagreeable and unsightly. Even with present knowledge, practically all dust nuisances are preventable, and legislation the country over is diminishing the dust output from smelters, from cement plants, and from smoking chimneys, often with the result that the collection of dust incident to smoke prevention becomes a source of profit. Specific instances of the wastes mentioned are.cited in subsequent pages. LOSSES THROUGH INEFFICIENT METHODS OF TREATMENT AND USE. Losses through inefficient methods are not always realized, sometimes because proper practice has not been developed, but oftener because of ignorance resulting from lack of technical supervision, or because of prejudice against its employment. The increase in efficiency of method will surely be greater in the future than in the past, although no fable is more wonderful than the history of the development of the metallurgy of iron through the introduction of the Bessemer and the open-hearth processes, the recovery from the waste gases of...show more

Product details

  • Paperback | 180 pages
  • 189 x 246 x 10mm | 331g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236541111
  • 9781236541116