MAGNETS TOSS VOICE BACK LIKE AN ECHO (Aug, 1933)

MAGNETS TOSS VOICE BACK LIKE AN ECHO

When a World’s Fair visitor speaks into the device shown above, an electric echo throws back his words after a pre-set interval up to several minutes. One set of magnets impresses the voice on a moving steel tape, and a second set picks it up. The effect sounds like an echo from a cliff, but undistorted and amplified. Delayed speech is useful in transatlantic radiotelephony, where a speaker’s reply is held up in transit to give relays time to close.

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4. Photograph Records Both Portrait and Voice (Sep, 1934)
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