Astronomy

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By Martin Davidson

This publication presents an up to date and authoritative define of our wisdom of the heavenly bodies—their distances, dimensions, lots, constitutions, temperatures, etc.—and explains the tools utilized by the astronomer for buying this data. so far as attainable whatever other than common mathematical therapy of the issues has been kept away from within the textual content, except for the bankruptcy on Navigation. the place it has appeared fascinating tougher mathematical issues were relegated to footnotes on the ends of chapters or to the Appendices which, besides the fact that, will not be crucial for figuring out the themes defined within the textual content.

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Bar, causing the whole spectrum to oscillate so that the Ha line also oscillated in unison with the second or lower viewing slit, but the solar image and the eyepiece being fixed, it was possible to Any part of the obtain a steady view of the Sun in hydrogen. solar disk could be placed on the first slit by the telescope controls but already described. (See Fig. ) While the Hale spectrohelioscope was still more or less in the experimental stage, Dr. Anderson suggested the alternative arrangement mentioned above under the Spectroheliograph, in which the slits and spectrum remain fixed and the solar image and eyepiece move in unison.

We now have to discuss some phenomena which, owing to the brilliance of the photospheric light, are not so easily observed and require special apparatus to isolate their radiation from the general glare in order to make them visible. » are so rare and fleeting that much useful research is impossible. We have seen that the photosphere, in spite of its composition of extremely rarefied gas, presents, mostly by reason of the granules, an apparently opaque surface of extreme brilliancy. This surface radiates light of every visible frequency or wave-length, so that in the spectroscope a complete or 'continuous' spectrum is produced.

15 the light rays passing through the slit to THE LINE SHIFTER a concave mirror 15 feet behind it. This This glass deflects the returned the light by reflection in a parallel Ha line by a small beam to a diffraction grating mounted measured amount when turned to a slight angle. ]ust behind and between the two slits. The same principle of Ihis grating dispersed the beam into a refraction is used in both the line shifter and the lon g spectrum, a portion of which fell by Anderson prisms. reflection from the grating on to a second oncave mirror immediately underneath the first.

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