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MANAGERS AND PROJECTIONISTS 1235
have to produce the most sharply defined images. This consideration would place the motion picture projectors as closely as possible to the center line, but there is the additional consideration of the increasing practice of simultaneous operation of stereopticon, effect projector and motion picture projector to secure special and very beautiful effects which lose much of their beauty if the images are not very closely matched. These considerations have led your committee to classify its recommendations regarding transverse location of equipment as follows:
For the installation of either two or three motion picture projectors, stereo, and effect projector, with or without spot lamps and flood projector, we recommend that the axis of projection of the motion picture projector nearest the stereo be at right angles to the horizontal axis of the screen.
For installation of three motion picture projectors with or without spot lamps we recommend that the axis of projection of the center projector be at right angles to the horizontal axis of the screen.
For installations comprising two motion picture projectors only (or with the addition of spot lamps) we recommend that their axes of projection make equal and opposite angles with the horizontal axis of the screen.
In certain special cases it will be highly desirable to locate the projection room in (not on) the front of the balcony. In such cases a careful check of the balcony construction should be made to insure that there will be no shifting of the axis of projection as the balcony fills and empties. Ventilation of a projection room so located becomes more of a problem than in the case of the more