Transactions of the Society of Motion Picture Engineers (1916)

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ii Fig. II Showing the part shaded of the solid angle of radiation from the ends of the source, which is diaphragmed by the aperture plate. The radiation from the ends of the source falling upon the shaded marginal zone of the condenser is not fully utilized on account of the diaphragm action (II) of the aperture plate. I n 35. V / U--_^ ■^^i^ / 2_r f ^^^ "" 1 7 ^ 4* Fig. 12 The diaphragm shows the relative length of paths in an ordinary condenser through zones at a distance of 5, 15, 25 and 2S millimeters from the axis. 54