A grating spectrometer developed for installation in a Canberra aircraft is described. An electronically operated heliostat maintains an image of the sun on the entrance slit. Resolution of 2 cm -1 is achieved with a lead sulphide detector. Preliminary results are given for the 2 μ region for heights up to 45 000 ft.
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Houghton et al. (1958) studied this question.
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