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70 rransactioiis of S3LP.E., Vol Xlll, No. 37, 1929
used in the photographic recording of sound by our Standards and Nomenclature Committee. ^° They have also under consideration the proposals made by the Cinematograph Group at the Seventh International Congress. A few patents have been accepted related to improvements in motion picture film strips for various purposes, such as a means for quick identification, ^^ strengthening the perforation area,^^ and attaching paper leaders.^^
Efforts to modify the usual photographic materials include ( 1 ) the use of a translucent paper support,^* (2) a patent granted on motion picture film having a protected surface and a metallic support,^^ (3) the use of a bichromated instead of a silver image,^^ and (4) the commercial introduction of a diazo compound impregnated viscose film of extreme thinness known as ' ' Ozaphane ' ' film.^^ The last named material contains substances which combine in the presence of ammonia to form a dye but they are decomposed by light. A positive image is therefore obtained directly from a positive.
Funger^^ has published data on edge fog stating Holmolka's explanation of this effect of aging which is said to result from the migration of traces of free soluble bromide from the edges toward the center. A serpentine or wavy leader on motion picture film has been patented which makes contact with the spool flanges at different points as a means of preventing edge fog.^®
Formulas for hypersensitizing panchromatic materials have been given by Jacobsohn.^° A new infra-red sensitive film has been announced which is sensitized with ' ' Kubrozyanine. ' '^
B. Studio and Location
Uniform diffuse illumination has been suggested for studio lighting whereby the ceiling is a white hemisphere illuminated by spotlights.^^ Descriptions have been published of several German and English studios. ^^ The extensive adoption of sound motion picture production programs has resulted in comprehensive changes in studio construction.^" One producer during the summer of 1928 built an entire new city for making sound pictures exclusively.^* It comprises 25 buildings covering 40 acres.
Camera Lens.es and Shutters. Although many large aperture lenses have been made available commercially, there has been no new fundamental principle of lens design discovered in the last
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