His voice recorder consists of the bore is a long spiral groove one. Which rotates with the crank Both sides of this pipe is a small cylinder with plates, means of protection and he sends a voice recorder with the instructions provided with the Johnny cruise (John Kruesi) Assistant Chief of the factory. When the cruise leading the mechanical construction is finished coming, Edison. But the cruise is still not understood that this machine is useful, however, until Edison speech put into the cylinder as "Mary have a small sheep" and turning it on again. It has come out that "Mary have a small sheep" surprise to the workers in the factory is very simple. Audio recorder, considered a masterpiece that he favored most. He later improved the voice recorder came a telegraph recorder (Automatic Telegraph Repeater)
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