Abstract

A method for measuring the relative intensities of spectral lines is described in which a step diaphragm is substituted for the slit of a spectrograph. A continuous source of light then produces on the photographic plate a set of bands over which the intensity of the light varies as the widths of the openings in the step diaphragm. Necessary precautions in the use of the method are noted. Results from this method are compared with those obtained by varying the distance to the source. Possible errors in measurements on relative intensities of spectral lines due to the Eberhard effect and to the use of an intermittent source are mentioned.

© 1933 Optical Society of America

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