Elementary Practical Hygiene

Elementary Practical Hygiene

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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. 1901 edition. Excerpt: ...the tube being weighed both before and after the experiment. 3. Charcoal may be prepared by heating an animal or vegetable substance in a vessel from which air is excluded. 4. When charcoal is heated in an open dish, the greater part of it--the carbon it contains--passes off combined with oxygen as carbonic acid gas, and the mineral matter is left as a greyish residue. 5. When coal is heated in a glass tube, various gases pass off, some of which are combustible, and coke remains. Coke is an impure variety of carbon. 6. The value of a fuel depends on the proportion of combustible matter it contains. 7. The amount of water contained in a food substance may be determined by thoroughly drying a known weight, and noting the decrease in weight. CHAPTER XX. COAL-GAS. Apparatus and Materials required.--Hard glass test-tube fitted with cork and tube (Fig. 91), trough of water, beehive shelf, gas-jars, discs, taper, coal-dust, a few feet of indiarubber tubing, clay tobacco-pipe, solution of soap, evaporating-basin or saucer, lime-water. The preparation of coal-gas by the distillation of coal was illustrated in the preceding chapter, but it was observed that the gas formed was associated with various impurities. The manufacture of coal-gas for domestic purposes is carried on in a similar manner, the coal being heated in large iron retorts, but the products of its decomposition are separated by a somewhat complicated system of purifying processes. Some of the impurities evolved with the gas may be removed by allowing it to pass through cold water, as in the following experiment: --Experiment.--Fit up the apparatus for the preparation of coal-gas as described in the last chapter, but collect the gas in an inverted jar of water, standing in a trough..show more

Product details

  • Paperback | 60 pages
  • 189 x 246 x 3mm | 127g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 123687773X
  • 9781236877734