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.

© 1939 Optical Society of America

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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).
    [CrossRef]
  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. Patent1,672,672.
  7. Lange, Physik. Zeits. 31, 964 (1930).
  8. Gleason, Rev. Sci. Inst. 3, 556 (1932).
    [CrossRef]
  9. Baker, Elec. J. 31, 359 (1934).
  10. Wilson, Elec. J. 32, 270 (1935).

1935 (2)

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

Wilson, Elec. J. 32, 270 (1935).

1934 (1)

Baker, Elec. J. 31, 359 (1934).

1932 (1)

Gleason, Rev. Sci. Inst. 3, 556 (1932).
[CrossRef]

1930 (1)

Lange, Physik. Zeits. 31, 964 (1930).

1928 (2)

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

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

1926 (1)

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

Anderson, John S.

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).
[CrossRef]

Baker,

Baker, Elec. J. 31, 359 (1934).

Behr,

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

Gibson,

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).
[CrossRef]

Gleason,

Gleason, Rev. Sci. Inst. 3, 556 (1932).
[CrossRef]

Kinsley,

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

Lange,

Lange, Physik. Zeits. 31, 964 (1930).

Sharp,

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

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

Smith,

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

Weaver,

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

Wilson,

Wilson, Elec. J. 32, 270 (1935).

Young,

Young, U. S. Patent1,672,672.

Elec. J. (2)

Baker, Elec. J. 31, 359 (1934).

Wilson, Elec. J. 32, 270 (1935).

J. Opt. Soc. Am. and Rev. Sci. Inst. (1)

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

Physik. Zeits. (1)

Lange, Physik. Zeits. 31, 964 (1930).

Rev. Sci. Inst. (1)

Gleason, Rev. Sci. Inst. 3, 556 (1932).
[CrossRef]

Trans. III. Eng. Soc. (3)

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

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

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

Other (2)

Young, U. S. Patent1,672,672.

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).
[CrossRef]

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Figures (1)

Fig. 1
Fig. 1

Schematic sketch and wiring diagram of null indicating, direct-reading Photox photometer.