A second needle and an amplifier were on the other side. When sound waves were forced into the receiving end, it caused the membrane to vibrate and the needle to etch a groove into the foil as the cylinder was being turned by the crank, thus recording sound. On one side was a diaphragm, or very thin membrane, connected to a needle. He eventually designed a device he called the phonograph that had a brass cylinder wrapped in tinfoil, which rotated and moved lengthwise when turned by a hand crank.
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