Abstract
A 3-metre Ebert grating spectrometer with a mock interferometer attachment is described, which works at high resolving power in the visible and near infra-red. The design considerations are enumerated; they are more peculiar to a grating spectrometer than to an interferometer although there are some additional problems associated with the Fourier transform mode of operation. Instrumental tests are performed in the visible spectral region to test the validity of the theory in Paper I. The instrument is used to take part of the emission spectrum in the 3 μ band of gaseous ammonia.
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