| − | 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. | + | {{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. |