A Kentucky professor, David E.Hughes, started a new line of development by adapting a Bell telephone into a "microphone," a fantastic little instrument that would detect the noise made by a fly in walking across a table.

Francis Blake, of Boston, changed a microphone into a practical transmitter.

The Rev.Henry Hunnings, an English clergyman, hit upon the happy idea of using carbon in the form of small granules.

And one of the Bell experts, named White, improved the Hunnings transmitter into its present shape.

Both transmitter and receiver seem now to be as complete an artificial tongue and ear as human ingenuity can make them.