Kelvin water dropper

[Mr Eastwood]

Hi,  if you haven't seen this before it's pretty cool.

A brief wiki explanation
http://en.wikipedia.org/wiki/Kelvin_water_dropper

Prof. Walter Lewin giving a demonstration.
http://ocw.mit.edu/high-school/physics/demonstrations-on-video/conductors-capacitors-dielectrics/demonstration-kelvin-water-dropper-revisited/

[TechJunkie]

Thanks for the post, interesting read... I have heard of this before but never knew much about it.

[SeanB]

I remember IIRC Rimstar did a nice recent video on this as well, with stuff you can build at home with household stuff like cans, plastic bottles and a little work involving scissors and some aluminium foil.