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  1. A. J. Allen and R. G. Franklin, J. Opt. Soc. Am. 29, 1 (1939).
    [CrossRef]
  2. 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.
  3. Easy-Flo solder obtainable from the Air Reduction Company is excellent for this purpose.
  4. The curves were supplied through the courtesy of Professor L. A. DuBridge and Mr. Le Roy Apker of the University of Rochester.

1939 (1)

J. Opt. Soc. Am. (1)

Other (3)

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.

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Figures (4)

Fig. 1
Fig. 1

Drawing of a hydrogen arc having a metal envelope and giving high intensity of continuous ultraviolet radiation. F, Oxide-coated nickel screen filament. C, Water-cooled copper anode. A, Water-cooled copper cathode assembly. Q, Quartz window sealed onto brass envelope with Glyptal. I, Porcelain insulator. E, Evacuating tube and lamp support.

Fig. 2
Fig. 2

Schematic drawing showing electrical connection for hydrogen arc. A, 10-amp., maximum safe continuous current. A1, approximately 40 amp. V, approximately 60 v, d.c. V1, approximately 2 to 2.5 v.

Fig. 3
Fig. 3

Spectrograms obtained with Hilger E-1 quartz spectrograph and unsensitized Eastman process plates.

Fig. 4
Fig. 4

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.