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A scanning Ebert-type spectrometer with paraboloidal mirror and off-plane slits has been constructed in a steel pipe that can be evacuated. Details of the grating support and rotation drive that achieved smooth reproducible scans are given. The scanning slit must be tilted through an angle proportional to the tangent of the grating angle. This validates the specular reflection formula for off-plane slits. The grating has 293 grooves mm -1 and a ruled area 20 cm wide by 7 cm long. About 90% of the theoretical resolving power has been realized in direct scans.
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Stanley C. Baker (1967) studied this question.
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