The Chemistry of the Sun

The Chemistry of the Sun

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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. 1887 edition. Excerpt: ...more perfect means were there than those placed at our disposal by photography? Photography has no personal equation, it has no inducement to twist a result either in one direction or the other, and it moreover has this excellent thing about it, that the results can be multiplied a thousandfold and can be recorded in an absolutely easy and safe manner. There were other reasons why photography should be introduced in this part of the work. We see at once that it was quite easy to introduce the process of purification of the spectra to which I have already drawn attention, by merely comparing a series of photographs. Again, it was quite possible by the use of the electric lamp to veiy considerably surpass the dispersion which Angstrom had employed. So that, if impurities had been suggested, there was now a method which has not yet been challenged of getting rid of them; if the dispersion was then insufficient there was nothing to prevent it being made very much more considerable, because a perfect photograph will bear a very considerable amount of magnification. There were also many other obvious lines of research, especially some in connection with multiple spectra, which seemed to promise new facts. But the upshot of the whole matter was that more work was wanted, and that in this work photography should be utilized. CHAPTER XVI. INTRODUCTION OF PHOTOGRAPHY. 1. Method Enjoyed. Tue method of photography that was adopted may now he stated. One object was to compare the light of the sun with the light of the vapour, in the electric arc, of any particular substance that we wished to observe. Such a comparison of the Fraunhofer lines, with those visible in the spectrum of the vapour of each of the metallic elements would enable us to study each more

Product details

  • Paperback | 122 pages
  • 189 x 246 x 7mm | 231g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236536304
  • 9781236536303