Abstract
The image orthicon television-camera tube has been tested as the light receiver for a fast nebular spectrograph on the 36-inch telescope. Observations of astronomical objects, with exposure times of up to 90 min, demonstrate the ability of the system to record faint emission features which could not be reached by photographic methods on this telescope. However, various effects that are peculiar to the image orthicon such as beam bending and low latitude, seriously limit the quantitative aspects of the spectra. More encouraging results have been obtained with a high-gain imaging photomultiplier (English Electric Valve P829) which permits the certain recording of individual photoelectrons. A pulse counting field photometer utilizing this type of tube is being developed. At the 60-inch solar telescope the imaging photomultiplier has been used for highdispersion work on the planets and bright stars.
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