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These are porcelain to glass to Kovar insulators obtained from the Stupakoff Laboratories, Inc., 6627 Hamilton Avenue, Pittsburgh, Pennsylvania. The Kovar ends are soft soldered to the brass cap and to the filament lead to form a vacuum-tight insulating seal.
Easy-Flo solder obtainable from the Air Reduction Company is excellent for this purpose.
The curves were supplied through the courtesy of Professor L. A. DuBridge and Mr. Le Roy Apker of the University of Rochester.
Drawing of a hydrogen arc having a metal envelope and giving high intensity of continuous ultraviolet radiation.
Schematic drawing showing electrical connection for hydrogen arc.
Spectrograms obtained with Hilger E-1 quartz spectrograph and unsensitized Eastman process plates.
Spectral energy distribution of metal hydrogen arc operating at 10 amperes plate current. Uviarc arc operating at 2.4 amperes and 60 watts. Data given as transmitted by B and L monochromator with 0.025-mm entrance and exit slits. Energies measured with calibrated sodium cell.