The Tesla Oscillator: combining in one mechanism the dynamo and steam engine.
The face is that of Tesla, and it’s the very first photograph taken of phosphorescent light.
This is a picture of Twain in Tesla’s laboratory circa January 1894. The time it took for exposure was 10 minutes.
Experiment showing play of electric sparks between condenser plates, produced by electric coil. The coil, standing in the center of a large room, is unconnected with the energizing circuit.
Tesla showing an experiment that illustrating the lighting of an incandescent lamp in free space from induction by coil below, energized by a circuit below.