The theatre of science; a volume of progress and achievement in the motion picture industry (1914)

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0 f ^ c i e n c e 179 building well lighted by ample window surface and skylights so that the daylight might be used ; however, a large percentage of the scenes are photographed under artificial lights from special lamps made for that purpose. The film is then sent up to the dark room, put on a rack, and is developed, and the finishing touches put to it in the hypo tank, washed in filtered water in the washing machine with very fine sprays, dried by air, and then sent to the printing room, where the negative film is printed by electric printing machines on the positive film. The positive film is then put through the process of being developed, washed by a washing machine with filtered water, put into a glycerine bath, which hardens the emulsion on the film, then dried by warm filtered air, polished to remove the scratches, then joined with film cement in the proper order and then sent to the testing room, where it is projected and the defects, if any are found in the film, are taken out and the perfect film is wrapped in tissue paper and put into a tin can ready to be shipped to the film exchange.