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Gas-filled tubes operate by Ionizing the gas with applied Voltage to start Electrical Conduction . Both hot- and cold- Cathode type devices are encountered. Depending on application, either the Glow from the gas or the Arc discharge may be the desired function. SWITCHING GAS-FILLED TUBES Some important examples include the Thyratron , Krytron , and Ignitron tubes. LIGHTING AND DISPLAY GAS-FILLED TUBES Specialized low-pressure gas-filled tube devices include the Nixie Tube (used to display numerals) and the Decatron (used to count or divide pulses, with display as a secondary function). Neon Signage and Neon Lamp s are other types of low-pressure gas-filled tubes. Xenon Flash Lamp s are gas-filled tubes used in Camera s and Strobe Light s to produce bright flashes of light. OTHER TYPES OF GAS-FILLED TUBES A type of gas-filled tube called the Geiger-Müller Tube is used to detect and measure Ionizing Radiation . One of the proposed designs for a fusion reactor is basically a gas-filled tube, the Farnsworth-Hirsch Fusor . A tube in which electrons move through a vacuum (or gaseous medium) within a gas-tight envelope is called an Electron Tube . SEE ALSO EXTERNAL LINKS
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