International Review of Educational Cinematography (Jul-Dec 1929)

Record Details:

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When the wire thus magnetized was fixed between the poles of another electromagnet connected directly with a loud speaker, the electro SOUND RECORD : 1. Eletromagnet 3. Cells 2. Steel wire 4. Microphone magnetic variations of the wire were transformed into identical currents, which, by causing the membrane of the loud speaker to vibrate, reproduced the sound registered with the most perfect accuracy. SOUND REPRODUCTION: 1. Electromagnet 2. Steel wire 3. Loud speaker Dr. Stille has perfected the invention of the Danish scientist, by making it available for practical use. Thanks to a very tenacious steel 6-ing], 197