A Textbook on Chemistry

A Textbook on Chemistry

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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. 1861 edition. Excerpt: ...leakage, to each other by a flange, so as to form a perfect sphere. One. of them has a stop-cock, through which the air may be exhausted, and on this being done, it will be found almost impossible to pull them apart, though as soon as the air is readmitted, and its pressure restored to the interior, they will fall asunder by their own weight. If over the mouth of an open receiver, a, Fig. 194, a piece of bladder be tightly tied with a waxed thread, Fig. Im.-when the air is exhausted the bladder becomes deeply depressed into a spherical concavity by the superincumbent pressure, and finally bursts inward with a loud explosion. It is upon the principle of atmospheric pressure that the various instruments used by surgeons for cupping act. One of the most simple methods of performing this operation is to place the cupping glass for a moment over the flame of a spirit lamp, and then transfer it rapidly to the skin. Spirits of wine, when burning, forms a very large quantity of steam, which of course fills the interior of the glass in a rarefied state by reason of the high temperature of the flame. As soon as this steam condenses a vacuum is formed, and the soft surface on which the cup is placed is pressed into its interior. For many of these experiments an air pump is not nec What are the Magdeburg hemispheres? What is the principle illustrated How is the process of cupping performed? in thfsp various experiments 1 A essarily required, but simple contrivances will answer in its Fig. 195. stead. Thus, if we take an eight-ounce vial, .c rssia, Fig. 195, and fit to the mouth of it a cork, b, through which there passes a piece of glass tube, c, drawn into a narrow jet at one extremity, but open at the other, by placing Fe the finger over the opening and..
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Product details

  • Paperback | 144 pages
  • 189 x 246 x 8mm | 268g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236499891
  • 9781236499899