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passes through a great distance in the sun’s
atmosphere. He tried this with the annu-
lar eclipse of 1836, with a negative result
which has never been accounted for, and
which seemed to condemn Brewster’s view.
In 1859 Kirchoff, on repeating Frauen-
hofer’s experiment, found that, if a spirit
lamp with salt in the flame were placed in
the path of the light, the black D line is in-
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