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DEVELOPMENT OF THE NEGATIVE
along the top edge of the tray, after which the small amount of cloth protruding may be trimmed off, leaving a neat cloth-lined tray which is water and solution-proof. The cut shows a rack on an empty tray ready for winding on the film.
Metal trays should be painted thoroughly inside with a coating of Probus paint, which is a paint impervious to the action of either acids or alkalies and which may be obtained from any dealer in photographic supplies. Sheet-iron is better than galvanized iron or tin as the coating of tin or zinc is' liable to peel off after short use and expose the metal underneath to the action of the solutions.
If a developer is one not easily oxidized, such as Metol-Hydrochonon, it may be used a good number of times by keeping it in an air-tight glass carboy. Films may be dried upon the racks after washing but as the pins cause a kinking of the film it is better to construct some sort of a drying drum upon which the film may be wound for drying and washing.
One of the most compact outfits for the development of motion pictures is the Spiral Reel invented and manufactured by R. P. Stineman of Los Angeles, California. It consists of a metal spiral with a thread or groove which holds the convolutions of film in a loose roll, parts of which are far enough apart to allow the developing solutions to act upon the sensitive surface and yet not close enough for any of the layers of film to stick together. Two hundred feet of film can be wound upon a spiral twentythree inches in diameter and completely immersed in two gallons of developer.