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The device consists of a cathode ( filaments), anodes ( phosphor) and grids encased in a glass envelope under a high vacuum condition. The cathode is made up of fine tungsten wires, coated by alkaline earth metalFor alternative meanings see metal (disambiguation). In chemistry, a metal is an element that readily forms cations and has metallic bonds, and it is sometimes said that it is similar to a cation in a cloud of electrons. The metals are one of the three gr oxideAn oxide is a chemical compound of oxygen with other chemical elements, e. rust ( iron oxide) or bauxite ( aluminium oxide). Oxides are extremely common in Earth's crust, and indeed in solid matter throughout the universe. Oxides are usually created throus, which emit electronThe electron (also called negatron commonly represented as e&minus is a subatomic particle. In an atom the electrons surround the nucleus of protons and neutrons in an electron configuration. Electrons have the smallest electrical charge and when they movs. These electrons are controlled and diffusedThis article is about the physical mechanism of diffusion. For alternative meanings, see diffusion (disambiguation). Diffusion is the spontaneous spreading of something such as particles, heat, or momentum. The phenomenon is readily observed when a drop o by the grids, which are made up of thin metal.