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Expired
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GB541/29A
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Individual
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Individual
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Publication of GB303752ApublicationCriticalpatent/GB303752A/en
G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
G03D—APPARATUS FOR PROCESSING EXPOSED PHOTOGRAPHIC MATERIALS; ACCESSORIES THEREFOR
G03D15/00—Apparatus for treating processed material
Abstract
303,752. Rehlõnder, P. Jan. 5, 1928, [Convention date]. Comparison photometers.-The co-efficient of diffusion of a kinematograph film support containing white material in suspension is determined by passing a parallel beam of light therethrough, directed normally to the plane of the film, and measuring the intensity of the transmitted light in two directions respectively (a) inclined at an angle of 78¥‹, and (b) perpendicular to the plane of the film. The ratio a/b of these intensities is the required co-efficient.
GB541/29A1928-01-051929-01-07Improvements in films for taking cinematograph pictures
ExpiredGB303752A
(en)