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80 Transactions of S.M.P.E., Vol. XIII, No. 37, 1929
The importance of strict supervision of the processing of sound films has been stressed by Coffman^^^ who gives also valuable data on the design of developing machines and the composition of developing solutions.
The printing of sound motion picture films has resulted in many modifications in printer design, a number of v^hich have been patented.^^^
Stereoscopically related pictures may be printed according to a patent specification describing a special printer for the purpose/^^
Tinting and Toning. A single solution dye toning formula has been suggested by Crabtree and Ives containing, besides the dye, acetone, ferricyanide and acetic acid/^^
Editing and Splicing. Two devices for editing film have been described, each of which projects an image on a viewing window/^* In one of them a still picture is projected without the use of an intermittent or a shutter, a. rotating spiral mirror and a series of plane mirrors being used. A few patents related to splicing and editing apparatus have been granted.^^^
Title Making. A method of introducing backgrounds in titles has been described which consists in photographing a projected motion picture and subsequently printing in the title matter either by double exposure or double printing/^^
Cleaning, Reclaiming, Rewinding, and Storage. A multiple synchronous rewind has been devised permitting the simultaneous rewinding of three picture films and their corresponding sound film.^^'' Only three patents were thought to be of interest in connection with methods of cleaning and reclaiming film.^^^ A container for storing film has been patented, the novelty of its design being a trapped recess in the walls connecting with the outer air.^^^
II. Distribution
To facilitate distribution, a producer makes two negatives of each picture ; from one, 200 prints are made for American circulation ; from the other which is shipped to England, about 140 prints are made for European use.^^° Forty-four Film Boards of Trade have been established by the Motion Picture Producers and Distributors of America to aid in film distribution.^®^ Over seven hundred institutions receive the benefit of showings of free film.