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absorption acid activation energy aerial Ansco aperture areas camera exposure cathode-ray tube characteristic curve charge chemical coated color compounds concentration constant decrease density determined diameter distribution dots Eastman Kodak effect electrons electrophotographic emulsion energy experimental exposed exposure index film focal length formation function gamma gamma-ray gelatin grain grams halftone hydroquinone Incorporated increase intensity lamp latent image layer lens lenses light maximum measured ment method Metol mole negative obtained paper Phot photographic materials physical development plate polarizing positive printing produced quinone radiation rate of development ratio reaction reciprocity failure ripening Rochester safety factor screen sensitivity sensitometric sensitometry shown in Fig shows shutter silver bromide silver chloride silver halide silver ion sodium sodium sulfite spectral speed stabilizing solution sulfite surface T. H. James temperature thallous thiosulfate thiourea thyratron tion unduloid values velopment Volume x-ray York