Abstract

A method is described whereby spectral sensitometry is facilitated by the addition of a biprism to the optical train within a spectrograph. The modified instrument affords a spectrogram divided into three zones of relative intensities $\frac{1}{2}$, 1, $\frac{1}{2}$. In any spectral region, the characteristic curve of the emulsion can be determined from transmittance measurements on line images in all three zones. Although rather similar to the use of a step filter, the method has advantages over other techniques for homochromatic sensitometry.

© 1949 Optical Society of America

Photographic Sensitometry With Fluorescent Oils

George R. Harrison
J. Opt. Soc. Am. 11(2) 113-123 (1925)

Dependence of the Sensitivity of Unsensitized Photographic Emulsions upon Temperature*

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

Sunlight and Skylight as Determinants of Photographic Exposure. II. Scene Structure, Directional Index, Photographic Efficiency of Daylight, Safety Factors, and Evaluation of Camera Exposure

Loyd A. Jones and H. R. Condit
J. Opt. Soc. Am. 39(2) 94-135 (1949)

The Herschel Effect and the Structure and Stability of the Photographic Latent Image*

G. Kornfeld
J. Opt. Soc. Am. 39(6) 490-494 (1949)

Emulsion Calibration Scale for Quantitative Spectroscopic Analysis

Harold K. Hughes and R. W. Murphy
J. Opt. Soc. Am. 39(6) 501-504 (1949)