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{{stub}}The Crookes tube is an experimental device developed by [[William Crookes]].  It is a glass tube which is filled with a gas.  Electrodes in the tube allow energy to pass through the gas causing it to glow.

'''Crookes tube''' is an experimental device developed by [[William Crookes]].  It is a glass tube with specific electrodes within it, from which most of the air has been evacuated.  Electricity is applied to the electrodes within the tube.  Thus, energy passes from one electrode to the other, both of which are within the glass tube.  One of the electrodes has a specific shape, Crookes used a cross, thus demonstrating that electrical activity flowed in straight lines from one electrode to the other.  The electrical action causes the gas within the tube to glow.  A demonstration of the principle can be viewed [http://micro.magnet.fsu.edu/electromag/java/crookestube/ here]. At one time this was high science, and Crookes tube was used by scientists who followed him as they proved additional principles with electrical energy.