The electronics company Philips gave in 1931 de Dutch film-maker Joris Ivens the assignment for an advertising film with sound which was new in the chronogical history of film.
The subject of the film is the production of radio´s and speakers: the camera registers the rhythm of the machines and the interaction with the proceedings of the factory workers and shows the operations inside the Philips Radio plant: In a mêlée of activity, glassblowers make delicate glass bulbs, machinery assists the bulb manufacture, a virtuoso glassblower begins a more complex tube used in radio broadcasting, workers perform their various specific assembly-line tasks. Cases are manufactured and machined, wire harnesses are assembled, loudspeakers are produced. As radios near completion, they are run through a series of tests. Engineers and draughtsmen define future developments. In a closing stop-motion sequence, in a style reminiscent of Norman McLaren, a group of loudspeakers performs a playful dance.
This film is also known as "Industrial Symphony".