The Phonofilm See and Hears It -- November 23, 2024

Toronto Star, 04-November-1924

Lee De Forest, a pioneer in vacuum tubes and radio, introduced his Phonofilm sound-on-film picture process in 1923. By 1924, his movies were showing in major theaters.

Toronto Star, 04-November-1924

Kingston Whig-Standard, 21-November-1924

Plastigrams were 3-D movies that used a process invented by Frederic Eugene Ives and Jacob Leventhal. The movies were viewed with red- and blue-lensed glasses. Note that Plastigrams were billed above the feature.