Michel Jullian wrote: > > From: "Frederick Sparber" <[EMAIL PROTECTED]> > Sent: Thursday, April 13, 2006 2:33 PM > > > Electrically fieldless, but not gravity fieldless, Michel. > > That's what I had understood Fred, besides if it was gravity fieldless we > would already have discovered antigravity and there would be nothing to test > with this tube :) > Precisely > > > If electrons are released at the bottom and gravity repels them upward, > > I think a Faraday Cup can be used to detect them. > > I'll probably make a fool of myself but what's a Faraday cup, and how would > you produce the slow electrons? > A Faraday cup is a match to a Faraday (flying?) saucer.
Only kidding. I googled up this image. If the evacuated hollow tube has a heated filament (or photo-emissive device) in a can at the bottom with a hole in the top that allows an electron of nearly zero upward velocity (another faraday cup?) if the electrons repel gravity they should fall up with force F = ma where they are detected/timed by an electrometer tied into the faraday cup collector. http://home.earthlink.net/~chutko/ionmeas.htm " A Faraday cup consists of two coaxial isolated cylinders: grounded outer screening cylinder and inner collecting one (collector). It works like "black body" in optic absorbs all particles which pass into collector and significantly decrease the output of secondary particles created due to interaction of primary particles with the surface of collector. The ratio of the input aperture diameter to the length of the collector should be not less than 1 : 5." > Fred > Best wishes > Michel >
