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Chemistry in High Schools

Chemistry in High Schools


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About the Book

Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: veying the gas from this carbureter to the laboratory; this prevents the flashing back of the flame through the pipes. Instead of the ordinary Bunsen burner it is advisable to use one in which the air and the gas supplies may be independently and accurately regulated. The expense for gasoline during the past three months has been about one cent per hour for ten burners. The air pump is driven by a six-inch water motor manufactured by the Divine Water Motor Co. of Utica, N. Y., price $5.00. The pulleys and mechanism for applying the power to the pump were obtained by adapting the foot-power mechanism of an old sewing machine at a cost of $2.00. There would be no difficulty in substituting a small electric motor (say a strong fan motor) for the water motor above. Where neither electric nor water power is available the following device may be used as a source of power: A derrick consisting of four 2x4 scantlings, well braced, and about 20 ft. high is used to raise a strong box filled with sand or other heavy objects. In order to have enough rope or wire cable to wind on the drum, a system of pulleys, consisting of 3 or 4 fixed at the top and 2 or 3 at the bottom, is used. This will give 100 or 140 ft. of rope to be wound on the drum. The mechanism of the whole device is shown in Fig. 5. The large cog-wheel a and the drum b run on the same axle. The rachet c allows the drum to be turned from right to left in winding up the weight. Source of Current for Electrolytic Work. As a rule, electrolytic work requires a direct current of low voltage. At present this is obtained either from battery cells (dry cells), or from high voltage (110 volts) direct-current lighting systems by wasting nine-tenths of the energy. Both of these sources are inefficient, uneconomical, or trou...


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Product Details
  • ISBN-13: 9780217458757
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 152 mm
  • No of Pages: 108
  • Spine Width: 7 mm
  • Width: 229 mm
  • ISBN-10: 0217458750
  • Publisher Date: 14 Oct 2010
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 168 gr


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