ONCE UPON A TIME. Columbia Pictures Corp., c1944. 10 reels, sd.

Credits: Producer, Louis F. Edelman; director, Alexander Hall; story, Norman Corwin, Lucille Fletcher Herrmann; screenplay, Lewis Meltzer, Oscar Saul; adaptation, Irving Fineman; music score, Frederick Hollander; music director, M. W. Stoloff; film editor, Gene Havlick.

© Columbia Pictures Corp.; 22Apr44; LP12612.

AS ONDAS DE LUZ. Encyclopaedia Britannica Films, Inc., c1946. 1 reel, sd., 16mm.

Credits: Collaborator, H. Horton Sheldon.

© Encyclopaedia Britannica Films, Inc.; 4Jun46; MP718.

LES ONDES DE SON ET LEURS ORIGINES. Encyclopaedia Britannica Films, Inc., c1948. 1 reel, sd., b&w, 16mm. French version of "Sound Waves and Their Sources."

Summary: With animated drawings the film describes several types of sound sources, including the vocal organs, and explains frequency, amplitude, wave length, and harmonics.

Credits: Collaborators, Harvey B. Lemon, Hermann I. Schlesinger, Harvey Fletcher, Donald MacKenzie.

© Encyclopaedia Britannica Films, Inc.; 16Sep48; MP3379.