A modification of Harrison's microphotometer has been developed, following his suggestion, which is used for accurate measurements of line widths on spectrograms. A vertical optical system using microscope lenses focuses the light on a bismuth-silver thermocouple. Accurate readings of length are obtained with a finely constructed micrometer screw. Studies have also been made on the relative intensities of lines on both optical and X-ray spectrograms. The instrument is also of use in testing the uniformity of thin films of metal.
Proceedings of the Iowa Academy of Science
©1927 Iowa Academy of Science, Inc.
Gwinn, I. J.
"A Microphotometer for the Study of Spectograms,"
Proceedings of the Iowa Academy of Science, 34(1), 279-279.
Available at: https://scholarworks.uni.edu/pias/vol34/iss1/81