Radio Messages

Duration: 10 min

Format: 16mm

Sound: Sound

Description: EB Films. Sound waves, direct currents, alternating currents, voice current, carrier wave and amplification as basis of radio are explained, with microphone, transformer and the modulator shown in operation.

Complete Record: Category: Electronics Subcategory: O.I.A.A. Type: Motion Picture Price: $50. Format code: 16sd

Metadata Source:Index of Training Films 1946