Handbook of General Therapeutics Volume 3

Handbook of General Therapeutics Volume 3

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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. 1885 edition. Excerpt: ...take the round number of 1200 lbs.=600. kilogrammes, an amount which may be wholly or partially compensated by friction, even though this be slightly reduced, the results are the ratios given in the following table: -----VOL. III. U C 0 The figures given in this table for mercury and water pres sure correspond to the medium elevation of the barometer and are subject to the variations of atmospheric pressure. The water manometer in the apparatus of course does not show these figures, but quite different ones. As already mentioned, it only shows the height of the water in the outer cylinder, and its height in the inner one must be calculated from that. The diflerence of the two marks the water pressure.-It must also be remembered that the weight of the inner cylinder itself is also to be taken into account in the calculation: this amounts to something over 10 lbs. If our object is to compress the air, we therefore place upon the cylinder a weight 10 lbs. less than that the effect of which we wish to obtain; conversely for rarefaction of the air, 10 lbs. more must be suspended to it. If, for example, we wish to apply a pressure of 30 lbs.=19 millimetres mercury pressure=;1U atmosphere, we must place only 20 lbs. on for compression on the other hand, for rarefaction suspend 40 lbs. The Employment of the A pparatas as a Spirometer. If we suspend on the chains of the apparatus weights equal to the weight of the inner cylinder, viz. 10 lbs., it remains in equilibrium at-every height if the stopcock is open. It then represents a perfect spirometer, and 1 centimetre of cylinder height answers to 573 cubic centimetres of capacity, and we have only to multiply the number of centimetres which the cylinder rises to find the value of the vital capacity..show more

Product details

  • Paperback | 282 pages
  • 189 x 246 x 15mm | 508g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 123689121X
  • 9781236891211