Practical cinematography and its applications (1913)

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64 PRACTICAL CINEMATOGRAPHY does not stock it, he can procure it to order within a day or two. Moreover the film will be new and in perfect condition. Therearemany other reasons why it is advisable to select and to adhere to this stock, which, although of a technical character, are of much importance to the user. It must be borne in mind that the technics and chemistry of cinema- tography are still in their infancy, and the technical staff retained for the preparation of the various ingredients employed in the sensitizing of the film are striving constantly to improve and to increase the speed or sensitiveness of the emulsion. The result is that the worker who uses Eastman film keeps pace with developments. The makers of this ribbon were the first to discover a base and emulsion suited to moving-picture work. This was achieved only after the expenditure of enor- mous sums of money, after hundreds of fruitless experiments, and with the co-operation of the highest technical and chemical skill. Under these circumstances the limitations of the base and of the emulsion become thoroughly understood, so that the film is certain to maintain the highest quality. On the other hand, those firms who have embarked upon the manufacture of the commodity only within recent years, have still to face and to overcome many pitfalls which the older concern discovered and surmounted years ago. So the