Annals of Electricity, Magnetism, and Chemistry; And Guardian of Experimental Science Volume 7

Annals of Electricity, Magnetism, and Chemistry; And Guardian of Experimental Science Volume 7

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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. 1841 edition. Excerpt: ...For this purpose I smoked three plates of po lished rock-salt, so that two marked D and E absorbed together as much dark heat (very nearly) as the third plate A did alone. 17. I may take this opportunity of mentioning the way in which I have succeeded in smoking inflammable surfaces without burning them, or crystallized plates, like rock-salt, which crack and fly by the direct application of the flame of tube 10 or l5 inches long, against the side of which the flame partly plays, affords a stream of comparatively cool smoke, which may be applied to any given surface. With these three smoked salt-plates I obtained the following results: ---As most of these results are from single experiments, the first and the last line must be considered as almost identical, and certainly does not-indicate any material specific difference in the absorbent qualities of one thick and two thin films of smoke, which might be expected, if the action were a merely superficial one. 18. From these numbers we deduce another conclusion of some importance. Since a film of smoke transmits most easily heat of low temperature and refragibility, we may expect that it will modify the quality of any compound beam of heat which it transmits, and that one such transmition will therefore render a second more easy. Now, we find that the plate D. transmitted 26 per cent of heat from the first of the above sources, and that of the 26 rays escaping from D. and falling upon a second smoked film E., E transmitted 7'3, or 28 per cent of those incident upon it. But by the third line of the table E. transmitted 23'5 per cent only of the direct rays, consequently the capacity for transmition has been increased. In the same way for Locatelli heat we find the per centage for E. raised...
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Product details

  • Paperback | 216 pages
  • 189 x 246 x 12mm | 395g
  • United States
  • English
  • black & white illustrations
  • 1236984323
  • 9781236984326