Details of two bilateral slits designed for use in an infra-red spectrograph are described. The widths of the slit openings may be continuously varied from 0 to 4 millimeters in one case and from 0 to 12 millimeters in the second case. The designs permit reproducible fine control of these widths.
Correct formulae for curvature of prism and grating images are given without derivation.
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