One of Thomas Edison creations was the phonograph. He did many test to find out how this "phonograph" would work. He only used a needle and a cylinder to make this device. He was able to do this because when u spoke into the mouthpiece the voice vibrations would move the needle and indent into the cylinder. People say that he had finished this invention on August 12, 1877, but it is more likely he had completed it November or December of that year.