By an empirical modification of Hurter and Driffield's and Ross formulae, it has been possible to express the blackening of a photographic plate exposed to monochromatic light as a function of intensity of light and time of exposure with an accuracy within the limits of the experimental data at hand. By means of monographic charts the constants of the equations can be computed by semi-graphical methods.
Proceedings of the Iowa Academy of Science
©1921 Iowa Academy of Science, Inc.
Helmick, P. S.
"The Blackening of a Photographic Plate as a Function of Intensity of Monochromatic Light and Time of Exposure,"
Proceedings of the Iowa Academy of Science, 28(1), 119-119.
Available at: https://scholarworks.uni.edu/pias/vol28/iss1/25