Third Dimension Movies And E X P A N D E D Screen (1953)

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THREE-DIMENSIONAL MOTION PICTURES 173 can be operated and synchronized by the camera or other means. There are several other systems employed In the making and projecting of stereoscopic motion pictures. The Parallax Stereograms, Lippman's "IntergraF* Sys tem, The system used by William Friese-Greene in 1893, in which he employed two negative films, one behind each lens. The various "grid" systems in which a screen made up of a number of parallel opaque bars are employed. The process employed by Jean Zafiropulo which uses a film containing embossed spherical 4 lens elements in its base. None of these systems however is now contemplated for use, so will have no immediate interest for the reader.