Abstract
FOR investigations of the sun it is usual to employ spectrographs of considerable weight and length, which it would obviously be impracticable to mount on an equatorial telescope. The plan generally adopted is to place the apparatus in a room where it can be firmly fixed and kept at a constant temperature, and to direct the solar image into it by means of a mirror.
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A New 18-inch Cœlostat. Nature 121, 247–249 (1928). https://doi.org/10.1038/121247a0
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DOI: https://doi.org/10.1038/121247a0