Abstract
Z emulsion require at least 30 minutes for proper exposure of the lines with the Climax coronograph-an impracticable exposure time if a region of the corona is to be explored for variations of line intensity ratio. We have used electrostatically focused, single stage tubes, loaned to us by the Carnegie Image Tube Committee, to speed up exposure. The image on the output phosphor of the tube was photographed on 35-mm film using a fast lens at roughly unity magnification. With a selected tube and a dispersion of about 15 A/mm, a 28-mm diam solar image and a 50-~ slit width, the exposure time is one minute on Plus-X film. The coronal lines of Fex, XI, XIV, and XV are also obtained by normal methods within a few hours of these exposures. Quantitative measurements of the spectra are now being made.
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