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absorbed absorption band acid Aniline Blue apochromatic apparatus back lens beam bichromated gelatin blue-violet light bright camera Canada balsam central disk-stop Cine-Kodak colored object condenser ring cover glass crater desiccated detail disk Eastman Eosine exposure trials exposure varies eyepiece F filter fixing bath focus focused grams Sodium green ground glass Haematoxylin inch iris diaphragm lamp lantern slides lenses light source lines low power magenta magnification maximum contrast mercury method Methyl Green Methyl Violet Methylene Blue micro microscope minutes monochromatic motion photomicrography mount necessary negative Nigrosine numerical aperture obtained optical orange panchromatic film panchromatic plate photographed plate or film possible preparations printing PROCESS FILM red end red light resolving power rinse safelight screen seconds sensitive Sizes Per Doz Sodium Carbonate solution source of light specimens spectrum standard exposure Sudan IV tion transmit transparent tube tungsten ultraviolet viewing device visual wave length Wratten X Factor yellow