Phonograph
Thomas Edison made his first phonograph with the mouth piece of the early telephone and some tinfoil. He thought he could talk into the mouth piece to make a disk vibrate, as the disk vibrated a needle would put grooves in the tinfoil. When Edison adjusted the machine to play and cranked the lever, he was surprised to hear his voice play back to him. He said his ideas rarely worked the first time. These cylinders could record sound, but due to their cylindrical shape, they could not be copied cheaply with a mold.