“More than 25 years ago I began my efforts to harness the cosmic rays and I can now state that I have succeeded in operating a motive device by means of them.
"I will tell you in the most general way. The cosmic ray ionizes the air, setting free many charges—ions and electrons. These charges are captured in a condenser which is made to discharge through the circuit of the motor.
I have hopes of building my motor on a large scale, but circumstances have not been favorable to carrying out my plan.
I do not use the plan involving the conductivity of the upper strata of the air, but I use the conductivity of the earth itself, and in this I need no wires to send electrical energy to any part of the globe.”
“Tesla’s Cosmic Motor May Transmit Power Round Earth.” Brooklyn Eagle July 10, 1932.