Interesting Picture which generates a couple of thoughts !

Was the old gun able to produce a set of beams while the vacuum held ? Or was this a test of being able to draw down the tube and have the vacuum hold? Or both? If it did produce a beam, any idea how long was it in a gone to air environment?

Thanks Charles !

Bob Hodge :scratch2:

What is the link?

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That's it. :thmbsp: