----- Original Message ----- From: "William Beaty" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Tuesday, June 05, 2007 10:02 PM Subject: Re: [Vo]:ion currents in pingpong balls
> On Mon, 4 Jun 2007, Michel Jullian wrote: > >> 1/ Is there any possibility that the dimple you inferred from your laser >> reflection could in fact be a (field-generated) goose pimple? > > Convex pimples make dark spots in the light reflected from the water > surface to a screen, while concave depressions make bright spots. It was > definitely a bright spot, a depression in the water. But note well that > this only occurred with an abnormal "thread." The usual "threads" make > 5mm holes in the mist, while the one which made the surface-dimple was > also creating a large region of obvious turbulence many tens of mm across. > The more common threads are too weak to create easily detected surface > deflections. > > >> >> 2/ Have you observed those airstreams on a solid collector? > > A friend has seen "spiderwebs" extending into the space around an > oil-wetted surface of an x-ray DC power supply. The "spiderwebs" had to > be back-lit in a darkened warehouse. So I gather the phenomenon hasn't been observed on a dry solid collector? > It is possible that all these phenomena are created by Electrospray, where > a droplet clinging to a charged surface begins emitting a series of > microscopic charged droplets. It's possible indeed. The microscopic charged droplets would probably further divide by Coulombic explosion and dry in mid air in the case of water, not in the case of oil. Michel > An older form of ink-jet printer was based > on this type of electrostatic droplet-series emission.
