Image Name: Modern Neon/Mercury Geissler Tube Gallery Page: Plasma Tubes 30" Uranium, Bromo Blue and Clear glass 640 x 480 pixels  (56 KB)   Back to Gallery Page: Plasma Tubes  Would you like to post a comment on this image? » In order to post comments you need to Sign Up for an Account. » If you already have an Account, you can Sign in. to post a comment.