Word: magnetos
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Dates: during 1894-1894
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...telephone in anything like its present shape was in 1876, when a very simple apparatus, which could transmit a few words and phrases, was placed on exhibition at the Centennial Exhibition by its inventor, Mr. Alexander Graham Bell. The first form was what is known as the magneto telephone, which consisted of an electro magnet at each end of the line in front of which were placed armatures. When one of these armatures was vibrated the same vibrations were observed in the other. Mr. Bell then found that by means of a small diaphragm he could transmit the sound waves...