About the Book
Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Pages: 99. Chapters: Vacuum tube, Barometer, Mirror, Fluorescent lamp, Glass-reinforced plastic, Picture framing glass, Insulated glazing, Gas-filled tube, Hourglass, Vitreous enamel, Glass-to-metal seal, Optical fiber cable, Glass electrode, Zytel, Bert Bolle Barometer, Heatable Glass, Snow globe, Sight glass, Self-cleaning glass, Windshield, Fibre-reinforced concrete, Glass float, Ceramic glaze, Laminate, Silver claret jug, Photochromic lens, List of glassware, Electron stimulated luminescence, Storm glass, Glass tiles, Glassing, Rhinestone, Glass-ceramic-to-metal seals, Fiberglass molding, Fiberglass sheet laminating, Display case, Glass-bottom boat, Georg Friedrich Strass, Glass-coated wire, Non-reversing mirror, Glassphalt, Came. Excerpt: In electronics, a vacuum tube, electron tube (in North America), or thermionic valve (elsewhere, especially in Britain), reduced to simply "tube" or "valve" in everyday parlance, is a device that relies on the flow of electric current through a vacuum. Vacuum tubes may be used for rectification, amplification, switching, or similar processing or creation of electrical signals. Vacuum tubes rely on thermionic emission of electrons from a hot filament or cathode, that then travel through a vacuum toward the anode (commonly called the plate), which is held at a positive voltage relative to the cathode. Additional electrodes interposed between the cathode and anode can alter the current, giving the tube the ability to amplify and switch. Vacuum tubes were critical to the development of electronic technology, which drove the expansion and commercialization of radio communication and broadcasting, television, radar, sound reproduction, large telephone networks, analog and digital computers, and industrial process control. Although some of these applications had counterparts using earlier technologies, s...
