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Unit Photography

Unit photography: A Perfect Negative to Unit Actinometry
A Perfect Negative, A Practical Analysis Of, Actinism And Diaphragm Systems, An Exposure Recompense, Classification Of Subjects, Comparison Of Different Actinicities, Derivation Of The Unit, Intensification, Law Of Constant Density, Measurement Of Opacity, Negative Making, Plane And Solid Angles, Problems In Unit Actinometry, Reduction, Reduction And Intensification, Still Another Optional...