Abstract

Photographs taken with panchromatic and with infrared plates yield visibility ratios which range from 1.1 for days with thick haze or light rain, to 1.7 for clear days (visibility 20 miles). These values indicate an upper limit of 0.3μ for the radius of drops in the thin haze.

© 1936 Optical Society of America

The Validity of the Photographic Reciprocity Law for Alpha-Rays

R. N. Wolfe and T. R. Wilkins
J. Opt. Soc. Am. 26(3) 105-110 (1936)

An Instrument for the Measurement of the Graininess of Photographic Materials *†

E. M. Lowry
J. Opt. Soc. Am. 26(1) 65-72 (1936)

Pressure Effect on Sensitivity of Different Photographic Films

Ny Tsi-Zé and Lü Ta-Yuan
J. Opt. Soc. Am. 26(1) 26-29 (1936)

The Photographic Intermittency Effect in the Region of Extremely Short Flash Periods*

J. H. Webb
J. Opt. Soc. Am. 26(9) 347-353 (1936)

Photographic Effectiveness of the Radiation from a Number of Photographic Sources

W. E. Forsythe and Miss M. A. Easley
J. Opt. Soc. Am. 26(8) 310-312 (1936)