Classicly

The Bell Tone is a science fiction short story written by Edmund Harry Leftwich. 

The transmitter is ready for operation. I have constructed a pair of metal disc-electrodes which clamp tightly to my head and press upon my temples. This device will pick up the thought impulses from my brain, feed them directly into the radio-frequency amplifier, where they will be amplified, and then radiated in a tight directed beam.