From Gakken's Sophisticated Science Kit for Adults, this replica kit uses the same technology that Thomas Edison used, replacing Edison's waxed pipe and stylus, the kit uses a plastic cup and a needle, but the end results are the same! You record your own voice on a plastic cup -- and play it back! Here's how it works, your voice vibrates the air minutely when it gets into the horn. Then the vibration is conducted to the needle and is
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