On Sep 21, 2004, at 4:53 PM, Peter L. Peres wrote:
>
> But they claim to have run tests to specifically exclude this
> possibility in a vacuum chamber and they say they're not ions.
>
Got a specific page with photos and/or measurements of one of the
lifters operating in vacuum?  I think you have to get pretty hard
vacuum before you do away with ion effects.  Sputtering, radiometers,
vacuum depositation, and others are examples of significant ion effects
in partial vacuums...

BillW

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