Receiving Radio Message (Principles of Radio - Part Two)
Erpi Classroom Films Inc.
Radio antenna described w/ animated diagrams showing aerial ground circuit. Transformer or tuning coil shown w/ primary coil causing magnetic field. Electrons flowing causing induced current; lines of force shown.
11:13:04 CU front of Zenith Wavemagnet home radio, hand on knob w/ tuning dial shown, inside radio w/ condenser shown. Animated diagrams showing positive & negative build up of electrons on condenser.
11:15:47 Oscillating current path shown changed to modulating current; reception & change back to oscillating.
11:16:24 Animated diagrams of crystal set shown w/ direct current thru crystal; earphone attached to circuit & current changing diaphragm to cause sounds through peaking of voice current. Condenser’s use to fill gaps from radio frequency variation.
11:18:50 Diagram showing steps in radio reception w/ electromagnetic waves striking air, corresponding oscillations set up in aerial ground circuit; tuning mechanism selects one radio frequency wave; the crystal changes the radio frequency current to a direct current; amplitude of this current is determined by audio frequency impressed on the carrier wave at the transmission station. Audio frequency current operates the earphones or speaker.
11:19:32 Boy listening to crystal receiving set w/ earphones; parts shown mounted on wooden board as simple receiver. Parts added & named. Parts in drawing replaced by symbols.
11:20:45 Writing desk w/ small bakelite radio; larger radio in wooden cabinet on table top by lamp & chair. The End. Note: Well-done animated illustrations possible for other gag uses.
Appliances; 1930s Entertainment; Educational Film; Oddities; Animation;
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Receiving Radio Message (Principles of Radio - Part Two) Erpi Classroom Films Inc. Radio antenna described w/ animated diagrams showing aerial ground circuit. Transformer or tuning coil shown w/ primary coil causing magnetic field. Electrons flowing causing induced current; lines of force shown. 11:13:04 CU front of Zenith Wavemagnet home radio, hand on knob w/ tuning dial shown, inside radio w/ condenser shown. Animated diagrams showing positive & negative build up of electrons on condenser. 11:15:47 Oscillating current path shown changed to modulating current; reception & change back to oscillating. 11:16:24 Animated diagrams of crystal set shown w/ direct current thru crystal; earphone attached to circuit & current changing diaphragm to cause sounds through peaking of voice current. Condenser’s use to fill gaps from radio frequency variation. 11:18:50 Diagram showing steps in radio reception w/ electromagnetic waves striking air, corresponding oscillations set up in aerial ground circuit; tuning mechanism selects one radio frequency wave; the crystal changes the radio frequency current to a direct current; amplitude of this current is determined by audio frequency impressed on the carrier wave at the transmission station. Audio frequency current operates the earphones or speaker. 11:19:32 Boy listening to crystal receiving set w/ earphones; parts shown mounted on wooden board as simple receiver. Parts added & named. Parts in drawing replaced by symbols. 11:20:45 Writing desk w/ small bakelite radio; larger radio in wooden cabinet on table top by lamp & chair. The End. Note: Well-done animated illustrations possible for other gag uses. Appliances; 1930s Entertainment; Educational Film; Oddities; Animation;