On Light in Three Courses Delivered At Aberdeen in Nov 1883 Dec 1884 And N
On Light in Three Courses Delivered At Aberdeen in Nov 1883 Dec 1884 And N
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To quickly assess the difficulty of the text, read a short excerpt:
We have no such means avail- able in the case of a star. How then would a change of refrangibility, if it exists, admit of detection ?
To go back to the railway, suppose the driver of the approaching train were to shut off the steam from his whistle before he reached the station ; how in that case could the observer on the platform detect a change in the pitch of the whistle as heard by him from what it would have been if the train had been at rest ? Only by comparing the note given by a whistl...e, or similar instrument which he carried about him, and which had previously been adjusted to unison with the same railway whistle when the train was at rest, with the note heard when the train is approaching the station.
Now can we find two kinds of light, of definite re- frangibility, one on earth and one in a star, which we know to be of equal frequency at issue ?
I have already referred to the remarkable spectrum of Sirius, and the overwhelming evidence which the coincidences of so many of its dark lines with the bright lines in the spectrum of incandescent hydrogen afford of the existence of hydrogen in the star.
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To quickly assess the difficulty of the text, read a short excerpt:
We have no such means avail- able in the case of a star. How then would a change of refrangibility, if it exists, admit of detection ?
To go back to the railway, suppose the driver of the approaching train were to shut off the steam from his whistle before he reached the station ; how in that case could the observer on the platform detect a change in the pitch of the whistle as heard by him from what it would have been if the train had been at rest ? Only by comparing the note given by a whistl...e, or similar instrument which he carried about him, and which had previously been adjusted to unison with the same railway whistle when the train was at rest, with the note heard when the train is approaching the station.
Now can we find two kinds of light, of definite re- frangibility, one on earth and one in a star, which we know to be of equal frequency at issue ?
I have already referred to the remarkable spectrum of Sirius, and the overwhelming evidence which the coincidences of so many of its dark lines with the bright lines in the spectrum of incandescent hydrogen afford of the existence of hydrogen in the star.
What to read after On Light in Three Courses Delivered At Aberdeen in Nov 1883 Dec 1884 And N?
You can find similar books in the "Read Also" column, or choose other free books by George Gabriel Stokes to read onlineMoreLess
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