Transactions of the Society of Motion Picture Engineers (1916)

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same arc lamp used today, the same two condenser lenses, the same aperture with tension plate, the same upper and lower sprockets, the same left-handed construction, and the same noise of an intermittently-moved film. Here is abundant opportunity for original research work and improvement. Nor have facts relating to lamp-house setting, lamp location, condensers, or other similar factors, been tabulated, — not even the averages of the thousands of machines in use today. I think it should be done. A condenser lens which I believe would be worth while to experiment with is the corrugated principle employed in light-house lenses. I hope that at our next meeting some one will be ready to read us a paper on lenses of this character.