Excerpt from The Astrophysical Journal, Vol. 25: An International Review of Spectroscopy and Astronomical Physics; January June, 1907
The telescope and collimator lenses had an aperture of 5 cm and a focal length of 40 cm. The telescope carried a plate-holder which could be r... otated about a vertical axis so that a considerable part of the spectrum could be brought into focus at one time.
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