Abstract
A NEW type of monochromator, built up of a number of ‘Polaroid’ films with intermediate quartz plates, is described by Prof. Yngve Öhman, who calculates the intensity of distribution in a spectrum transmitted by such a filter. Single bands of about 50 A. can be separated. Photographs are submitted comparing results obtained with a grating spectro-graph and with the new instrument, which appears to be especially useful in observing solar prominences, since the field of view is not limited by a slit as in the ordinary spectrograph.
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Points from Foregoing Letters. Nature 141, 165 (1938). https://doi.org/10.1038/141165a0
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DOI: https://doi.org/10.1038/141165a0