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The design and construction of a new high-resolution spectrograph for the visible and ultraviolet regions of the spectrum are described. The optical system is that due to Ebert, in which a plane diffraction grating is used in conjunction with a spherical mirror as collimator and camera. This system has several advantages over conventional concave grating mountings; a stigmatic image is formed and wavelength change is accomplished simply by rotation of the grating. The instrument described can also be used as a spectrophotometer, and can be adapted for use in the vacuum ultra-violet.
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G.W. King (1958) studied this question.
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