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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 31, Iss. 1 — Jan. 1, 1941
  • pp: 54–57

A New Projection Comparator-Densitometer

HARRY W. DIETERT and JOHN SCHUCH  »View Author Affiliations

JOSA, Vol. 31, Issue 1, pp. 54-57 (1941)

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The 1940 Applied Research Laboratories’ projection comparator-densitometer, using spectrum plates either 2″ × 10″ or 4″ × 10″, provides dual projection of a sample spectrogram and a master onto a translucent screen mounted directly before the operator. Using a slit system that moves into contact with the plate; a vacuum photo-cell, a two-stage compensated amplifier, and sturdy ammeter, the comparator-densitometer provides transmission readings on any spectral line, accurate to a few tenths of a percent. The unit is fast in operation allowing the operator to read easily as many as six lines per minute. Operating from 115-v, 60-cycle power supply, it achieves this accuracy with the minimum amount of care and upkeep.

HARRY W. DIETERT and JOHN SCHUCH, "A New Projection Comparator-Densitometer," J. Opt. Soc. Am. 31, 54-57 (1941)

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