Richardson's handbook of projection (1927)

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651 HANDBOOK OF PROJECTION FOR The shutter blade should be set at the narrowest point of the light beam in front of the projection lens. We therefore see that insofar as concerns necessarywidth of the master blade there are three governing elements, viz. : speed of intermittent movement, distance from center of shutter shaft to center of light beam and diameter of light beam. Figure 228. AERIAL IMAGE.— -The front surface of the converging condenser lens is focused at a point in front of the projection lens, except in the case of very short focal length projection lenses, in which case the image may be inside the lens barrel. The distance the aerial image will be from the