r of a century, several astronomers have taken up the problem of dis- tages over the vertical, and in like manner the vertical vided with spectroscopes for analyzing the lights of the corona and prominences, prismatic cameras for photo- covering a means of photographing the corona in broad has… … Fig, 2. scopes.” With such an army of organized observers, ing. In the photography of solar prominences, Prof. types, without sacrificing its efficiency in either posi- an immense amount of valuable information would Hale and Dr. Deslandres have obtained distinctly valu- tion, will be a valuable…
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