He may transmit vision as well as speech.

He may perfect a third-rail system for use on moving trains.

He may conceive of an ideal insulating material to supersede glass, mica, paper, and enamel.

He may establish a universal code, so that all persons of importance in the United States shall have call-numbers by which they may instantly be located, as books are in a library.
Some other young man may create a commercial department on wide lines, a work which telephone men have as yet been too specialized to do.

Whoever does this will be a man of comprehensive brain.