I. On the photographic spectrum of γ-Cassiopeiæ

Abstract

In the Bakerian Lecture for 1888 I referred in some detail to the spectrum of γ-Cassiopeiæ), and suggested explanations of the origins of the various lines which had been observed. At that time no photographs of the spectrum were available for discussion, but the questions raised by the eye observations were of such great interest that I determined to attempt a photographic study of the spectrum.