Madeira Spectroscopic: Being a Revision of 21 Places in the Red Half of the Solar Visible Spectrum with a Rutherfurd Diffraction Grating, at Madeira ... During the Summer of 1881
Madeira Spectroscopic: Being a Revision of 21 Places in the Red Half of the Solar Visible Spectrum with a Rutherfurd Diffraction Grating, at Madeira ... During the Summer of 1881
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. 1882 Excerpt: ...Sun, and with anything less than a most powerful spectroscope, this subject, though at sunset one of the chief features of the red and orange end of the Solar spectrum, is either actually invisible, or at least entirely unrecognisable. In my first visit to Portugal I could not, under the circumstances, see anything ...
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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. 1882 Excerpt: ...Sun, and with anything less than a most powerful spectroscope, this subject, though at sunset one of the chief features of the red and orange end of the Solar spectrum, is either actually invisible, or at least entirely unrecognisable. In my first visit to Portugal I could not, under the circumstances, see anything certainly different from the vanishingly faint Solar lines which occur at frequent intervals in that neighbourhood; but on the second occasion, with a larger and better apparatus, I was as surprised as delighted, to recognise three minute and faint bands of shade at about two bands breadth from each other; and something so very different from the needle like, mutual-separation character of thin Solar lines, that I made sure it was the noontide embryo of the Sunset o (alpha) band The aspect in the spectroscope was just as if Nature herself had touched in with a finely pointed camels-hair pencil, and a very light shade of Indian ink, three pale narrow bands amongst all the other sharp lines. But when a day of peculiarly fine definition arrived, lo! the band shade was gone, and I saw only two or three ultra thin and close lines in the place of each such band; while since then, as mentioned already on pages 10 and 11, I have come to recognise that such shaded bands are the production on the eye of lines too close to be separated and distinctly seen at the time. But the loss of the band haze of imperfect vision at Madeira did not prevent the embryo alpha band being distinguished: for repetitions of two or three lines, in groups at equal distances apart, is one of the most certain indications of telluric gas bands in Nature's cold way. EXAMPLE 1, or Angstrom's view of this difficult subject, is much assisted by his so-called high sun not having been, o...
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All Editions of Madeira Spectroscopic: Being a Revision of 21 Places in the Red Half of the Solar Visible Spectrum with a Rutherfurd Diffraction Grating, at Madeira ... During the Summer of 1881