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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 29, Iss. 11 — Nov. 1, 1939
  • pp: 470–470

A New Photographic Sensitometer

W. M. CADY  »View Author Affiliations

JOSA, Vol. 29, Issue 11, pp. 470-470 (1939)

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A sensitometer is described which affords a continuous variation of illumination across the sensitive surface. Two intensity-ranges are available, using the same source of light and the same exposure-time; with both ranges, the instrument can give an over-all variation of intensity in the ratio 2000: 1. No lenses or moving parts are needed, and the sensitometer is strictly neutral with regard to wave-length.

W. M. CADY, "A New Photographic Sensitometer," J. Opt. Soc. Am. 29, 470-470 (1939)

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  1. L. A. Jones, Photographic Sensitometry (Eastman Kodak Company, 1934).
  2. L. Silberstein and J. H. Webb, Phil. Mag. 18, 1 (1934).
  3. W. Kinder, Zeits. f. Instrument. 56, 393 (1936).

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