A scanner based on the principle of the classic microdensitometer was assembled for the purpose of rapid granularity determination. A rotary stage was used to allow the generation of a root-mean-square (rms) voltage signal proportional to rms Transmittance in the sample. A mathematical relation was then developed to calculate granularity. The scanner was calibrated and was proved capable of 10 percent accuracy with 95 percent confidence.
Library of Congress Subject Headings
Pollard, Melvin E., "An instrument for rapid determination of granularity in photographic film samples" (1971). Thesis. Rochester Institute of Technology. Accessed from
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