The Phonograph was the first great invention developed by Edison in Menlo Park. The machine had two needles: one for recording and one for playback. When you spoke into the mouthpiece, the sound vibrations of your voice would be indented onto the cylinder by the recording needle. This cylinder phonograph was the first machine that could record and reproduce sound created a sensation and brought Edison international fame. While he was working to improve the efficiency of a telegraph transmitter, Edison noted that the tape of the machine gave off a noise resembling spoken words when played at a high speed and this caused him to wonder if he could record a telephone message. So by attaching a needle with the diaphragm of a telephone receiver. Edison had reasoned that the needle could prick paper tape to record a message. His experiments led him to try a stylus which played back the short message he recorded, "Mary had a little lamb." August 12, 1877, is the date popularly given for Edison's completion of the model for the first phonograph.
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