Abstract
The recent development of photoconductive cells, sensitive in the near infra-red, has made possible the observation of the solar spectrum with a dispersion not previously possible. The McGregor tower telescope of the McMathHulbert Observatory and the McGregor Littrowtype spectrograph have been provided with a lead-sulfide, photoconductive cell, and means for recording the cell output. With this equipment we have produced a complete map of the infra-red solar spectrum on a scale of 1.6 mm/A, ending at 2o,6ooA. The wave-length limit of the map is set by the strong absorption of the telescope objective and the spectrograph collimator-camera lens. The measured resolving power on tracings obtained with this equipment is 32,000 at i6,oooA. Observations at large and small zenith distances from the sun have been made to aid in separating solar lines from the general background of terrestrial lines in this region of the solar spectrum. Many atomic lines have been identified on the first tracings obtained. Mc Math-Hulbert Observatory, University of Michigan, Lake Angelus, Pontiac, Mich.
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