It is the Lord Kelvin’s Water Dropper aka Lord Kelvin’s Thunderstorm, invented in the 1860s by William Thomson, 1st Baron Kelvin, the same fellow for whom the Kelvin temperature scale is named.

Shan writes - Sir William Thomson (Lord Kelvin 1824 - 1907) was appointed to the position of Chair of Natural Philosophy (the subject we now call Physics) in 1846. He remained at the University of ...

Lord Kelvin’s Thunderstorm is build around the concept of water droplets falling through inductors. Two streams of water fall from small holes in reservoirs at the top. Those streams fall ...