Spectrograms have been obtained of all but three of the predicted M series absorption limits of osmium, iridium, and platinum. A vacuum spectrograph of the Siegbahn type was used in this work. The slit of the spectrometer chamber was covered with a very thin celluloid film, smoked over a kerosene flame until sufficiently darkened to keep out the light of the incandescent filament. To make the film, celluloid was dissolved in amyl acetate and thinned until about like molasses. One small drop on the surface of water spread out forming a film two or three inches in diameter. After the amyl acetate had dissolved the film was lifted on a circular wire frame. After being dried, it was mounted over the slit with cement.
Proceedings of the Iowa Academy of Science
©1926 Iowa Academy of Science, Inc.
Rogers, R. A.
"The M Series Absorption Spectra of Osmium Iridium and Platinum,"
Proceedings of the Iowa Academy of Science, 33(1), 235-236.
Available at: https://scholarworks.uni.edu/pias/vol33/iss1/52