Transactions of the Society of Motion Picture Engineers (1929)

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Report of the Progress Committee 81 III. Exhibition A, General Projection Eqnipyyient Projectors and Projection. Each year, manufacturers of projection equipment have been endeavoring to make their apparatus more silent when running. With the advent of sound pictures, this feature becomes increasingly important and one firm recently demonstrated a machine especially designed for sound film projection.^^2 Two other new projectors have been made available for which certain advantages are claimed.^*^^ A projection device, called the ''Triptique" permits simultaneous projection of three pictures to give either a panoramic view or three separate inter-connected pictures.^^* A very rigid supporting stand for projectors has been designed which has six adjustable leveling points.^®^ An exhaustive comparison made between arc lamps with glass condenser systems and mirror arcs has been published and the results favor the arc lamp as being the most efficient illuminating unit.^^^ Calculations based on the best available arcs and optical systems show that 8,000 lumens is the maximum attainable light flux for screen illumination, only half of which is practically available. ^^'' A number of patents ^^^ have been granted covering various improvements in projector design, among others claw pulldown movements, arc illumination, mechanism for reversing film, modified maltese cross design, etc. Faulty projection conditions in theatres have been denounced by a meeting of the Technicians' Branch of the Academy of Motion Picture Arts and Sciences, although opinions were expressed that the indifference of some producers toward the theatre was partly to blame. The strict supervision necessary for sound pictures will alleviate the situation.^^^ Imperfect drying of the film and excessive heat on the film as it passes through the projector gate causes film buckling and it is suggested that the shutter should be placed between the light source and the gate in order to reduce the temperature.^^^ An analysis has been made by Naumann of temporary in and out-of-focus effects during projection.^^^ A projector equipped with a variable gate capable of handling different sized films has been patented, for example large films with two sets of marginal perforations or narrower films centrally perforated.^^^