Abstract

A null-reading photometer head is described which employs a Photox cell integrally mounted with a graphite-graphite commutator in such manner that the direct current in an external instrument is reversed synchronously with the exposure of the cell to standard and unknown source. The candlepower of a Mazda lamp may be read directly on a permanent scale.

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References

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  1. Gibson in Photoelectric Cells and Their Application, by John S. Anderson (Physical and Optical Societies, London, 1930), p. 157; Harrison, ibid., p. 118; Ives and Kingsbury, J. Opt. Soc. Am. 21, 541 (1931).
  2. Weaver, Trans. III. Eng. Soc. 23, 441 (1928).
  3. Behr, J. Opt. Soc. Am. and Rev. Sci. Inst. 10, 288 (1935).
  4. Sharp and Kinsley, Trans. III. Eng. Soc. 21, 117 (1926).
  5. Sharp and Smith, Trans. III. Eng. Soc. 23, 428 (1928).
  6. Young, U. S. Patent 1,672,672.
  7. Lange, Physik. Zeits. 31, 964 (1930).
  8. Gleason, Rev. Sci. Inst. 3, 556 (1932).
  9. Baker, Elec. J. 31, 359 (1934).
  10. Wilson, Elec. J. 32, 270 (1935).

Other

Gibson in Photoelectric Cells and Their Application, by John S. Anderson (Physical and Optical Societies, London, 1930), p. 157; Harrison, ibid., p. 118; Ives and Kingsbury, J. Opt. Soc. Am. 21, 541 (1931).

Weaver, Trans. III. Eng. Soc. 23, 441 (1928).

Behr, J. Opt. Soc. Am. and Rev. Sci. Inst. 10, 288 (1935).

Sharp and Kinsley, Trans. III. Eng. Soc. 21, 117 (1926).

Sharp and Smith, Trans. III. Eng. Soc. 23, 428 (1928).

Young, U. S. Patent 1,672,672.

Lange, Physik. Zeits. 31, 964 (1930).

Gleason, Rev. Sci. Inst. 3, 556 (1932).

Baker, Elec. J. 31, 359 (1934).

Wilson, Elec. J. 32, 270 (1935).

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