Discoveries and inventions of the nineteenth century (1905)
Routledge, Robert · London : G. Routledge and Sons · leaf 495
about twenty miles a second, which motion, there is reasonto believe, is chiefly due to a proper movement of Sirius. These deduc-tions from prismatic observations are of the highest value astronomically,since they will eventually enable the real motions of the stars to be deter-mined, for ordinary… … Fig. 231.—Solar Prominences, No. 2. turus, a bright star in the constellation Bootes, is approaching us with avelocity of fifty-tive miles per second. When the solar spots are examined with the spectroscope, the dark image-of the slit produced by the hydrogen line, F, is observed to show a…
Inventions
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