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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 26, Iss. 12 — Dec. 1, 1936
  • pp: 439–441

The Electric Welsbach Lamp

A. H. PFUND  »View Author Affiliations

JOSA, Vol. 26, Issue 12, pp. 439-441 (1936)

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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).

A. H. PFUND, "The Electric Welsbach Lamp," J. Opt. Soc. Am. 26, 439-441 (1936)

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  1. H. Rubens, Ann. d. Physik 18, 725 (1905).
  2. A. H. Pfund, Science 82, 597 (1935).
  3. Reflex Gas Mantle No. 107, manufactured by the Welsbach Company.
  4. A. H. Pfund, J. O. S. A. 25, 351 (1935).
  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).
  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.

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