Characteristic curves have been made for several types of negative films manufactured by Eastman Kodak Co. and of corresponding films manufactured by Agfa Ansco Corporation. Although the curves are remarkably similar, there are a few interesting differences.
Proceedings of the Iowa Academy of Science
©1937 Iowa Academy of Science, Inc.
"Comparison of Some Commercially Available Photographic Negative Materials,"
Proceedings of the Iowa Academy of Science, 44(1), 150-150.
Available at: https://scholarworks.uni.edu/pias/vol44/iss1/51