A growing source of silent era film information. This listing is from The Progressive Silent Film List by Carl Bennett. Copyright © 1999-2025 by Carl Bennett and the Silent Era Company. All Rights Reserved.

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	Henry Cass. Frame enlargement: Silent Era image collection.

Cast: Henry Cass [himself].

De Forest Phonofilm, Incorporated, production; distributed by De Forest Phonofilm, Incorporated. / Produced by Lee de Forest. / Premiered 12 April 1923 at the Engineering Societies’ Building Auditorium in New York, New York. Released 15 April 1923. / Phonofilm 35mm spherical format. Phonofilm sound-on-film synchronized sound system. / Full-sound film.

Speech.

Synopsis: An introduction to and explaination of the Phonofilm system.

Survival status: Print exists in the Library of Congress film archive (Maurice H. Zouary collection) [35mm positive].

Current rights holder: Public domain [USA].

Keywords: Early sound film - Synchronized sound film

Listing updated: 13 May 2010.

References: Film viewing : Geduld-Birth p. 96; Zouary-DeForest p. 136.