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| Film Daily, 04-April-1923 |
Doctor Lee De Forest was to give a public demonstration of his Phonofilm process, which recorded images and sound on the same strip of film. De Forest used the work of associate Theodore Case and his Case Research Lab. De Forest did not share credit. The demonstration may have been held at the Engineering Societies' Building which still stands at 25 West 39th Street in Manhattan.
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| Film Daily, 04-April-1923 |
De Forest proposed a weekly release program of Phonofilms.
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| Motion Picture News, 07-April-1923 |
The Pathé Company announced that its weekly Pathé Review would include sections in Pathécolor, a stencil process rather than a natural color process.
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| Motion Picture News, 28-April-1923 |
Sections of Cosmopolitan's movie Enemies of Women were hand-colored.
