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DEVELOPMENT OF THE NEGATIVE
worth. After one or two trials the worker will realize that the development of a 200 foot length of celluloid ribbon is no more difficult than the development of an ordinary kodak spool.
One thing the beginner will do well to bear in mind. He should adopt some particular brand of film and cling to it after he has become acquainted with its emulsion, speed, composition and peculiar characteristics. There are many different makes upon the market but it is preferable to select a film which is • easily obtainable at any time and in any part of the world. It is strongly urged that the beginner select the film stock made by some recognized maufacturer, such as the Eastman Kodak Company, the DuPont-Pathe Film Manufacturing Corporation, the Zeiss-Ikon Corporation, Agfa Corporation, Gevaert or other firms of equal reputation. The Eastman organization has its tentacles spread throughout the world. It has thousands of agencies in immediate touch with the different national companies. The result is that this film can be purchased without difficulty in nearly all parts of the globe. If a local dealer 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. When Eastman stock cannot be secured it will almost always be possible to secure Pathe stock. As this is practically identical with DuPont-Pathe film, it may be used with all confidence. It is almost impossible to find a place where either Eastman or Pathe service cannot be obtained, and in many cases both are available . These are the two oldest film companies now in operation. It must be borne in mind that the technique and chemistry of cinematography 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 enormous 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 became thoroughly understood, so that the film is certain to maintain the highest quality.
Before the beginner attempts development he must make sure that his dark room and accessories are adequate. To seek sue