Quote Originally Posted by Stephen Benskin View Post
Looking at the curve you uploaded more closely, "Negative Material B" is found on page 502 of the paper in the Journal of the Franklin Institute at the bottom half of the page. The same "Negative Material B" was used again on page 94 of Jones and Nelson's 1940 paper "A Study of Various Sensitometric Criteria of Negative Film Speeds." Personally, I like to go to the source material. It avoids some other authors interpretation of the materials.
I was referring to the fact that the curve "Negative Material B" was an archetype used by everyone and basically started with H&D. It is a long straight line with a slope of about 0.6 - 0.7. Thats all.