Transactions of the American Climatological Association for the Year Volume 1

Transactions of the American Climatological Association for the Year Volume 1

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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. 1884 edition. Excerpt: ...conditions which on the one hand vary the character of the air breathed, and on the other the respiratory ac tivity, that any opinion of the effect of dryness which we can formu. late will be only approximate. The chief effect, of course, is upon pulmonary transpiration, and enough can be gleaned from the experiments of Valentin, Sanctorius, Lavoisier, Seguin, Dalton, and others, to understand that this process is a very important part of our physiology; yet all of these investigators miss the mark we are now aiming at, which is to determine the amount of moisture exhaled (above that inhaled) in a dry more than in a damp atmosphere. They may all agree with Valentin that the amount exhaled in each twenty-four hours varies from 6,000 to 12,000 grains of vapor, according to the respiratory capacity, etc., in a man not severely exercising. I have not, however, been able to find any comparisons based upon the hygrometric condition of the air breathed. Temperature and altitude, with distance from the sea, are such powerful agents in producing dryness that it is well for us to divide our own inquiry--namely, the increased pulmonary transpiration in (1) warm dry, and (2) in cold dry air. First in warm dry as compared with warm moist air. Let us choose Yuma, Arizona, and Jacksonville, Fla, for the autumn of 1883, as they both had the same mean temperature for that season--7I '3. Dalton assumes, in his calculations, that the air passes from the lungs in a state of saturation, and Draper puts the dew-point of expired air at 94. Let us assume that the expired breath brought down to 94 is saturated with vapor; that an ordinary-sized man breathes eighteen times a minute (Quetelet) and expires twenty cubic inches at each breath when at rest (Hutchinson, more

Product details

  • Paperback | 36 pages
  • 189 x 246 x 2mm | 82g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236560671
  • 9781236560674