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If can, however, be put to valuable use in the Still Departments for any type of copy work or duplication. Aside from the economic advantage, this film offers in saving time by eliminating operations necessary in the customary course of making duplicates, it should also be considered that this direct method renders results with noticeably finer grain and sharper definition.
A detailed description, including a study of many points of practical and theoretical interest regarding this film type, has been presented by W. Barth at the 1936 spring convention of the S. M. P. E., and was published in the October, 1936, issue of their journal.
Increasing the Life of Motion Picture Projection Prints.
An improvement which Agfa Ansco recently has successfully introduced in their manufacturing process consists of a new method of casting the celluloid base, or film support, on which the emulsion is later coated. While this change might not be noticeable or of direct interest and benefit to the cameramen and laboratory technicians, it has helped to establish a remarkable record for Agfa Ansco products, particularly their 35mm. Positive film among the motion picture film exchanges and theater projectionists.
By this new process, the mechanical characteristics, or what is commonly known as "wear and tear" of the base, has been improved to an unusually large degree, minimizing the hazard of mechanically damaging the finished print, and correspondingly increasing the number of runs in projection machines with high intensity arcs.
Problems of Controlling Correct Photographic Reproduction
By DR. HERBERT MEYER, A. S. C.
PART II
Controlling Methods
Present day photographic technic utilizes many instruments and methods for the purpose of properly controlling most of the above relations.
Objective brightness and negative exposure are determined by light meters.
Speed and gradation of negative and positive materials are analyzed by sensitometric instruments.
Chemical development of both negative and positive materials is controlled by sensitometric methods.
Positive exposure is selected by semi-automatic timing instruments which produce a graduated scale test.
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