Abstract
A small grating spectrograph has been sent aloft on an unmanned balloon to an altitude of slightly greater than 124,000 feet (38 km) in an attempt to observe the day airglow emission. The balloon, 236 feet in diameter, inflated, was launched by the Geophysics Research Directorate from Vernalis, California, on November 1, 1960. The spectrograph, constructed of glass refracting optics and a plane reflection grating, was of conventional design except for a bafflling system used to minimize the amount of earth-shine and sunlight entering the slit. The spectrum from 5400–9000 A in the first order of the grating was photographed on an Eastman I-N plate, and, in the second order, from the glass cutoff to 5600 A, on an Eastman 103a-G plate.
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