jimlux wrote:
google "Kelvin water dropper"
A bit tricky to get them to work (insulation is the key) but lots of
fun. You can build really big ones (using things like 2 gallon metal
pails) or tiny ones.
Somewhere around I have a paper from the 19th century describing one
using a sort of shower head.
Probably this:
http://www.coe.ufrj.br/~acmq/fuller1.jpg
http://www.coe.ufrj.br/~acmq/fuller2.jpg
http://www.coe.ufrj.br/~acmq/fuller3.jpg
http://www.coe.ufrj.br/~acmq/fuller4.jpg
M. Fuller, "Machine à influence à jet d'eau," La Lumiére électrique,
Vol. 33, 39, 28 September 1889, pp. 623-626.