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Report of the Progress Committee 79
photographic solutions is rather meager. Reports of tests on the Kodak borax fine grain developer have been generally favorable. Namias^^^ also suggests a formula devised by 0. Mente. Another formula has been published anonymously.^^^ Glycin is suggested as a good developer for tests on color sensitivity of panchromatic emulsions.^^* Dundon and Crabtree^^^ have dealt extensively with the fogging properties of developers showing that desensitizers give complete protection against aerial developer fog. Results of an investigation by Luther^^^ support the theory that the specific action of soluble bromides is opposed to the reduction potential of a developer. According to Rzymkowski,^*^ the protective action of sulfite in a developer (hydroquinone) is the result of the formation of an addition compound with the reducing agent molecule which compound is oxidized in preference to the developing agent.
Printing. Specifications for a standard notch for a printer light change were recommended at the Seventh International Congress, London, July, 1928.^^^ A printer using a continuously moving film without optical compensation has been described, two designs being suggested applicable as well to projectors. ^^^ In one model the film moves tangentially near the edge of a disc so that the exposures are made through helical slots in the disc which expose the film from one side to the other as it advances. In a second arrangement the film moves radially across the surface of a disc which has radial slots of length equal to the height of a frame and which move across the film every time the film advances one frame. Both methods produce consecutive single pictures in the shape of a parallelogram. Emmermann^** has published a general paper on the usefulness of the optical printer. An article has appeared giving calculations of the friction and strain imposed on film at various speeds at the aperture of motion picture machines.^^^ Several patents deal with improvements in printer design."*^
Quantitative data have been worked out by Tuttle^^^ relative to the printing intensity of several lamps and methods of varying the intensity of such lamps have been considered.
Valuable notes on making duplicate negatives have been published by Ives and Huse with reference to the use of duplicating film.^** The use of color wedges for varying the contrast in the printing of duplicate negatives has been protected by Capstaff.^*^