The Kelvin water dropper, invented by Lord Kelvin (1867), is a type of electrostatic generator. Kelvin referred to the device as his water-dropping condenser. The apparatus is sometimes called the Kelvin hydroelectric generator, the Kelvin electrostatic generator, or Lord Kelvin's thunderstorm. The device uses falling water drops to generate voltage differences by using positive feedback and the electrostatic induction occurring between interconnected, oppositely charged systems.
Read more about Kelvin Water Dropper: The Setup, Principle of Operation
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“The water for which we may have to look
In summertime with a witching wand,
In every wheelrut’s now a brook,
In every print of a hoof a pond.”
—Robert Frost (1874–1963)