Lectures on Chemistry, Including Its Applications in the Arts

Lectures on Chemistry, Including Its Applications in the Arts

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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. 1841 edition. Excerpt: ... risk, for if the flame should by chance pass back through the exit tube, the whole mixture would explode, inevitably blowing the instrument to pieces. By using the very ingenious safety jet of Mr. Hemming, and employing a large bladder to hold the mixture, this form of the blowpipe may be adopted without the least fear of danger; and for experiments on the small scale, it is exceedingly convenient, combining power, security, and simplicity. Mr. Hemming's safety jet consists of a brass cylinder, about six inches long and three-fourths of an inch wide, filled with fine brass wire of the same length, which is tightly wedged by forcing a brass rod into the centre. The interstices between the wires form thus a collection of exceedingly minute tubes, through which the gas must pass. To one end of this cylinder is connected a bladder, containing the mixed gases, the other terminates in a jet from which the gases issue; now should the flame pass back through this tube, it would have to encounter a large mass of metal, which conducts heat so rapidly as to reduce the temperature of the gases much below that at which their union can Fig. 51. occur, and further combustion is consequently prevented. Fig. 51; is a view of the compression oxyhydrogen blowpipe, the safety tube of which contains a pile of circular discs of wire gauze, contained in the brass box, E. The wire gauze here acts in precisely a similar manner to the wires in Hemming's jet. Water: --By repeating the following experiment of Berzelius, the most positive determination of the composition of water may be obtained. Introduce into the small glass bulb, e, Fig. 52, a known weight of black oxide of copper; connect it by caoutchouc connectors, with the bulb g, on one side, and the tube containing...show more

Product details

  • Paperback | 106 pages
  • 189 x 246 x 6mm | 204g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236541936
  • 9781236541932