Abstract
1. Preliminary .—The apparatus and method of taking photographs of the spectra of metallic arcs under pressure have been described in previous papers. The arc was formed between two poles of the metal (not quite pure) 5/8-inch diameter and about 6 inches long, which were enclosed in a steel cylinder, the design of Prof. Petavel, F. R. S., capable of resisting a high internal pressure. The light from the arc passed through a window in the side of the cylinder, and was reflected by a system of mirrors upon the slit of the 21½-foot Rowland grating spectrograph in the Physical Laboratory of the University of Manchester. As in previous experiments, the spectrum of the second order was used, the dispersion being 1·3 Ångström Unit per 1 mm.
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