to make impressions on a strip of paraffined paper. To his amazement, the barley visible indentations generated a vague sound when the paper was pulled back beneath the stylus.
             In December 1877 Edison unveiled the tinfoil phonograph, which replaced the strip of paper wrapped in tinfoil. Many people would not believe what they were hearing including a leading French scientist who declared it to be a trick device of a ventriloquist. The public's amazement was quickly followed by universal approval. Edison became famous all around the world and was dubbed the Wizard of Menlo Park, although ten years passed before the phonograph was transformed form a laboratory curiosity into a commercial product.
             His most famous and most commonly used invention is
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