Abstract
Part I. Experimental procedure. A three meter focal length vacuum spectrograph, designed by Professor J. J. Hopfield, has been constructed at the University of California and used to photograph the extreme ultraviolet hydrogen band spectra. A description of the type of mounting and method used to focus the instrument is given. The greater dispersion and resolving power has made possible the measuring of additional lines. New tables of frequencies are given.

This publication has 15 references indexed in Scilit: