Long ago one George K. Spoor experimented with a primitive projection machine, started the first film distributing company, became a controlling factor in the old Essanay Co. In 1916 he quit film production but continued experiments to find new tools. Last fortnight, and again last week, Experimenter Spoor announced some new cinema devices which he had developed with the aid of two engineers —Fred J. Lindbergh (no kin) and P. John Berggren—and which, coming from George K. Spoor, may well prove important.

Natural Vision. In stereoscopy an...

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