Abstract

This lamp is to serve as a source of radiation from the visible into the far infrared. The heating unit consists of sheets of ashed Welsbach mantle heated by the glow or arc discharge formed between terminals connected to the secondary of a high potential transformer. When operated in air, a small, pointed gas flame is allowed to play on the mantle, thus steadying the electrical discharge and increasing the temperature. From 0.7 to 15μ, gas plus electricity are used, whereas, from 15μ, to 150μ, gas alone is employed. When the lamp is operated in a partial vacuum, variations in spectral distribution are effected largely by working at different pressures. At pressures around 10 cm the emission is similar to that of the gas Welsbach in the region of longer wave-lengths, while at pressures near 30 cm the emission rivals that of a Nernst lamp in the near infrared (0.7 to 15μ).

© 1936 Optical Society of America

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References

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  1. H. Rubens, Ann. d. Physik 18, 725 (1905).
    [Crossref]
  2. A. H. Pfund, Science 82, 597 (1935).
    [Crossref] [PubMed]
  3. Reflex Gas Mantle No. 107, manufactured by the Welsbach Company.
  4. A. H. Pfund, J. O. S. A. 25, 351 (1935).
    [Crossref]
  5. I am indebted to Dr. W. E. Forsythe who calibrated for me a tungsten lamp in terms of color temperatures vs. voltage drop through the lamp.
  6. A. H. Pfund, J. O. S. A. 23, 375 (1933).
    [Crossref]
  7. A. H. Pfund, J. O. S. A. 23, 376 (1933).
  8. Pliofilm is chlorinated rubber in sheet form, made by the Goodyear Rubber Company.

1935 (2)

A. H. Pfund, Science 82, 597 (1935).
[Crossref] [PubMed]

A. H. Pfund, J. O. S. A. 25, 351 (1935).
[Crossref]

1933 (2)

A. H. Pfund, J. O. S. A. 23, 375 (1933).
[Crossref]

A. H. Pfund, J. O. S. A. 23, 376 (1933).

1905 (1)

H. Rubens, Ann. d. Physik 18, 725 (1905).
[Crossref]

Pfund, A. H.

A. H. Pfund, Science 82, 597 (1935).
[Crossref] [PubMed]

A. H. Pfund, J. O. S. A. 25, 351 (1935).
[Crossref]

A. H. Pfund, J. O. S. A. 23, 375 (1933).
[Crossref]

A. H. Pfund, J. O. S. A. 23, 376 (1933).

Rubens, H.

H. Rubens, Ann. d. Physik 18, 725 (1905).
[Crossref]

Ann. d. Physik (1)

H. Rubens, Ann. d. Physik 18, 725 (1905).
[Crossref]

J. O. S. A. (3)

A. H. Pfund, J. O. S. A. 25, 351 (1935).
[Crossref]

A. H. Pfund, J. O. S. A. 23, 375 (1933).
[Crossref]

A. H. Pfund, J. O. S. A. 23, 376 (1933).

Science (1)

A. H. Pfund, Science 82, 597 (1935).
[Crossref] [PubMed]

Other (3)

Reflex Gas Mantle No. 107, manufactured by the Welsbach Company.

I am indebted to Dr. W. E. Forsythe who calibrated for me a tungsten lamp in terms of color temperatures vs. voltage drop through the lamp.

Pliofilm is chlorinated rubber in sheet form, made by the Goodyear Rubber Company.

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Figures (4)

Fig. 1
Fig. 1

Showing front and side views of lamp to be operated in air. Heating of mantle W is effected by gas flame F alone for long heat waves and by gas plus electricity for visible and near infrared radiations.

Fig. 2
Fig. 2

Showing side-view of lamp to be operated in partial vacuum. The mantle W is heated by the electrical discharge between platinum beads K.

Fig. 3
Fig. 3

Showing design of lamp adapted for use of radiating materials in cylindrical form.

Fig. 4
Fig. 4

Showing the emission, relative to that of a Nernst lamp (2240°K), of the gas-heated mantle (lower curve), and of the mantle heated by gas plus electricity (upper curve).