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

The 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 download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1841 edition. Excerpt: ...as the incident heat was more heterogeneous; dark heat undergoes very little change. It appears also by the last line of the table, that the increased roughness of b compared to a, had enhanced the characteristic effect (analogous to redness for light). 22. I have made a great many experiments to satisfy myself that the action of all the three media already specified (14) is precisely analogous, and that they actually insulate similar rays by absorption. The following table is a specimen, showing the increased facility with which rays of heat, from whatever source, are transmitted by smoked rock-salt after previous transmission through the same or other substances. Table showing the Per-centage of Transmission by the Smoked Mock-Salt Plate E for heat farom different sources, and modified by passing through the following Media. 23. It is very important to consider how this action of rough surfaces may be explained, and whether we have any analogous phaenomena in the case of light. Can it be owing to the circumstance that the depolished surface reflecting differently the various kinds of heat, those kinds least copiously reflected persevere, and form the majority of the transmitted rays? To this it may be replied, that the intensity of reflexion at polished surfaces is so insignificant at a perpendicular incidence for either heat or light, that were the whole specularly reflected heat, transmitted in the one case, and absorbed in the other, the difference, instead of amounting to 30 per cent, or more, of the incident heat 21, could not exceed 4 per cent. 24. Arguing from the analogous case of light, I anticipated on the contrary, that the reflected as well as the transmitted beam, would be more intense from such a surface, as it is well known that...show more

Product details

  • Paperback | 212 pages
  • 189 x 246 x 11mm | 386g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236647181
  • 9781236647184