Abstract

The time devoted to collecting and plotting emulsion calibration data can be reduced considerably by the use of a new transmittance scale which is logarithmic from 1 to 30 percent and which then expands non-uniformly to 97 percent. Data are presented from seven independent laboratories which establish the approximate linearity of the emulsion calibration curves for Eastman SA-1 films, SA-1 plates, SA-2 films, I-N plates, and 33 plates. The practical uses of this scale on plotting boards and in a special emulsion calibration paper are discussed.

In certain cases, all emulsion calibration procedures can be eliminated. A transmittance slide rule for use in the quantitative determination of tetraethyl lead in gasoline is described.

© 1949 Optical Society of America

Dependence of the Sensitivity of Unsensitized Photographic Emulsions upon Temperature*

Martin Biltz
J. Opt. Soc. Am. 39(12) 994-1008 (1949)

New “Offset” Method of Interpreting Spectrophotometric Curves

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J. Opt. Soc. Am. 39(1) 72-75 (1949)

The Quantitative Spectrographic Analysis of the Rare Earth Elements* III. Determination of Major Constituents in Complex Mixtures

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Effect of Stray Light in Prism and Grating Spectrographs on Emulsion Calibration Curves and Its Significance in Spectrographic Analysis*

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J. Opt. Soc. Am. 39(6) 494-496 (1949)