Report of the Chief Astronomer, 1909, Appendix No. 2: Astrophysical Work (Classic Reprint) - Softcover

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Excerpt from Report of the Chief Astronomer, 1909, Appendix No. 2: Astrophysical Work

Both forms of instrument are frequently required on the same night, for stars of varying brightness and type. The time lost in making the change from single to three prism or vice versa, and the uncertainty in the temperature conditions prevailing after the change, close temperature regulation being equally as important, perhaps more important than avoidance of moderate flexure, were considerations leading to the decision, which had the approval of Dr. King, to design and construct a separate single prism spectrograph, with separate temperature control and attaching stand, so that the change could be made in a minute or two, and without disturbance of tempera ture.

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