Later Developments
In 1862, Reis demonstrated his telephone to Wilhelm von Legat, Inspector of the Royal Prussian Telegraph Corps who produced an account of it (Legat, 1862), a translation of which was obtained by Thomas Edison in 1875 and was used in Edison's successful development of the carbon microphone. (The Legat account included drawings that are different from the one below suggesting that it is of a later version). Edison acknowledged his debt to Reis thus:
The first inventor of a telephone was Phillip Reis of Germany only musical not articulating. The first person to publicly exhibit a telephone for transmission of articulate speech was A. G. Bell. The first practical commercial telephone for transmission of articulate speech was invented by myself. Telephones used throughout the world are mine and Bell's. Mine is used for transmitting. Bell's is used for receiving. (Edison 2006, )
However Reis' telephone was not limited to musical sounds. Reis also used his telephone (the word also invented by Reis) to transmit his phrase "The horse does not eat cucumber salad". This phrase in German is hard to understand acoustically so Reis used it to prove if speech can be recognized on another side successfully.
Read more about this topic: Reis Telephone
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