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. THE VAN NORMAN DUPLEX MILLING MACHINE. Fig. 1. 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…
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