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A design of spectrograph mounting, novel in that convergent light falls on a plane grating, has been investigated theoretically and practically. The focal curve can be made flatter than that of the two existing mountings, the Rowland circle or the Wadsworth, the astigmatism can be made zero at one point on the plate and very slight elsewhere on the plate, and the dispersion, whilst less uniform than that of the Eagle (Rowland Circle), is more uniform than that of the Wadsworth mounting. Like the Wadsworth mounting, operation can be limited to two focusing controls, but this new mounting is more compact and has no heavy moving parts.
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A. H. Gillieson (1949) studied this question.
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