He will investigate how a child's voice, speaking from Boston to Omaha, can vibrate more than a million pounds of copper wire; and he will invent a finer system of time to fit the telephone, which can do as many different things in a second as a man can do in a day, transmitting with every tick of the clock from twenty-five to eighty thousand vibrations.
He will deal with the various vibrations of nerves and wires and wireless air, that are necessary in conveying thought between two separated minds.

He will make clear how a thought, originating in the brain, passes along the nerve-wires to the vocal chords, and then in wireless vibration of air to the disc of the transmitter.

At the other end of the line the second disc re-creates these vibrations, which impinge upon the nerve-wires of an ear, and are thus carried to the consciousness of another brain.
And so, notwithstanding all that has been done since Bell opened up the way, the telephone remains the acme of electrical marvels.

No other thing does so much with so little energy.

No other thing is more enswathed in the unknown.