This film was made to be shown in the Standard Oil exhibit at the at the 1939 New York World's Fair. Showings were accompanied by narration delivered "live" that would match the pre-recorded narration in the film, so that the stage narrator would ask a question answered by the screen narrator, and vice versa. Seen today, without the live narration, the film makes little sense.
Portions of this film are silent to permit an accompanying speaker to narrate some of the images.