Patent 2,792,746
Dr. Brian O'Brien's patent application for
methods to create curved screen rectified prints.

Courtesy of Thomas Hauerslev

Note that the film runs through the projector with the image upside down.

Dr. O'Brien and his design team deemed it necessary to create a projection print with correction for Todd-AO's deeply curved screen, approximately 120°, and from a high projection booth to remove all the geometric distortion that would occur if a conventional print was to be used.

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