The Astrophysical Journal, Vol. 55: An International Review of Spectroscopy and Astronomical Physics; January-June, 1922 (Classic Reprint) - Softcover

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Excerpt from The Astrophysical Journal, Vol. 55: An International Review of Spectroscopy and Astronomical Physics; January-June, 1922

The 40-inch refractor at Yerkes Observatory, although designed only for visual observations, has been available for astronomical photography since 1900 by means of a method perfected by G. W. Ritchey and described by him in the Astrophysical Journal for December of that year. The method c0nsists of the use of a ray-filter which absorbs those waves of short lengths for which the objective is uncorrected, combined with photographic plates which are especially sensitive to the yellow, a color which the ray-filter transmits freely, and which comes in the region for which the color-curve of the 40-inch objective is very nearly flat.

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