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On 11/28/2016 12:29 PM, jimlux wrote:
On 11/28/16 6:39 AM, Sietze van de Burgt wrote:
I found om Wikipedia quote a long time
Ago a description of a vandegraaf
Using gas instead of belts and also
Vollrath described an electrostatic generator using dust.
*Explosions in flour mills have been blamed on a combination of
explosive flour mixtures in the air and possibly electrostatic electric
discharges. Also of course lighting cigarettes, etc.
I used to work in a machine shop using line shaft machine drives
and corresponding belts to the shafts in the ceiling. The main drive
was a big induction motor connected to the shafts through a 6 inch
belt. There was a protective hardware cloth cage over the big pulley on
the line shaft end and in dry weather it would give 2 inch sparks to a
nearby water pipe feeding the sprinkler system. Sort of a primitive
VDG. I don't know if it would have given longer sparks if the pipe were
farther away because the cage was just mounted to wooden beams with no
low leakage insulation.
*
The Kelvin water dropper is another electrostatic charger.
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