Report of the Meetings Volume 1-2

Report of the Meetings Volume 1-2

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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. 1833 edition. Excerpt: ...any other secondary cause. Sir John Herschel, taking a wider view of the subject, remarks, " that it is no impossible supposition that the deficient rays in the light of the sun and stars may be absorbed in passing through their own atmospheres; or, to approach still nearer to the origin of the light, we may conceive a ray stifled in the very act of emanation from a luminous molecule by an intense absorbent power residing in the molecule itself; or, in a word, the same indisposition in the molecule of an absorbent body to permit the propagation of any coloured ray through or near them, may constitute an obstacle in limine to the production of that ray." For reasons which Iinay have an opportunity of explaining in another communication, I conceive that the original light of the sun is continuous from one end of the visible spectrum to the other, and that the deficient rays are absorbed by the gases enerated during the combustion by which the light is produced. %ut whatever be the manner in which these dark lines are occasioned, it is manifest that while they are of the highest value as affording fixed points in the spectrum, they render the sun's light absolutely unfit for experiments on absorption. We cannot, for ' In the spectrum formed by a narrow " beam of day-light," Dr. Wollaston had, previously to the year 1802, discovered seven lines, which he hasidesignated by the letters A, B, f, C, 9, D, E, the first line being, according to his observations, the extreme boundary of the red rays of the spectrum, and E the extreme boundary of the violet rays. The correspondence of these lines with those of Fraunhofer, I have, with some difiiculty, ascertained to be as follows: A, B, f, C, g, D, E, Wollaston's...show more

Product details

  • Paperback | 252 pages
  • 189 x 246 x 13mm | 458g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236843975
  • 9781236843975