Tesla unipolar dynamo shown by which a machine with a disc armature might be excited Image added March 1, 2015 - 12:22 AM
Schematic for Tesla's experiments with electrical discharges in vacuum tubes Image added March 1, 2015 - 12:22 AM
Illustration for disproving the Hertz-wave theory by two transmitters Image added March 1, 2015 - 12:22 AM