Application
Geissler tubes were mass produced from the 1880s as entertainment devices, with various spherical chambers and decorative serpentine paths formed into the glass tube. When the tube was handled (the terminals were insulated) the shape of the plasma changed. Some tubes were very elaborate and complex in shape and would contain chambers within an outer casing. If these were spun at high speed a visual disk of color was seen due to persistence of vision. (Somewhat similar devices in the form of stationary globes are now produced and sold for personal amusement.) As an educational tool they are also used to demonstrate the movement of electrons and the principles of a vacuum.
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“It is known that Whistler when asked how long it took him to paint one of his “nocturnes” answered: “All of my life.” With the same rigor he could have said that all of the centuries that preceded the moment when he painted were necessary. From that correct application of the law of causality it follows that the slightest event presupposes the inconceivable universe and, conversely, that the universe needs even the slightest of events.”
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—François, Duc De La Rochefoucauld (1613–1680)