Kelvin's Water Drop Electrostatic Generator

Photograph of Kelvin's water drop electrostatic generatorApparatus:
generator, water.

Control the flow of water such that the water drops break just above the corona.
To begin, there must exist a charge imbalance. As the water drops fall through the metal loops, electrostatic charge builds. One of the loops is positive and the other is negative. Once enough charge has been collected, current begins to flow, lighting one or more of the lights along the middle front edge of the apparatus.

PIRA 5A40.70