ultraviolet vapor lamp
61Geissler tube — The Geissler tube is a glass tube for demonstrating the principles of electrical glow discharge. The tube was invented by the German physicist and glassblower Heinrich Geissler in 1857. The Geissler tube was an evacuated glass cylinder with an… …
62Fluorescence spectroscopy — aka fluorometry or spectrofluorometry, is a type of electromagnetic spectroscopy which analyzes fluorescence from a sample. It involves using a beam of light, usually ultraviolet light, that excites the electrons in molecules of certain compounds …
63Indium tin oxide — (ITO, or tin doped indium oxide) is a solid solution of indium(III) oxide (In2O3) and tin(IV) oxide (SnO2), typically 90% In2O3, 10% SnO2 by weight. It is transparent and colorless in thin layers. In bulk form, it is yellowish to grey. In the… …
64Color photography — Color film redirects here. For the motion picture equivalent, see Color motion picture film. A circa 1850 Hillotype photograph of a colored engraving. Long believed to be a complete fraud, recent testing found that Levi Hill s process did… …
65Edmund Germer — (August 24, 1901 August 10, 1987) was a German inventor granted as the father of the fluorescent lamp. He applied for a patent with Friedrich Meyer and Hans J. Spanner on December 10 1926, which led to US patent|2182732. The patent was later… …
66Gum bichromate — is a 19th century photographic printing process based on the light sensitivity of dichromates. It is capable of rendering painterly images from photographic negatives. Gum printing is traditionally a multi layered printing process, but… …
67Electron configuration — Electron atomic and molecular orbitals Simp …
68Arc welding — uses a welding power supply to create an electric arc between an electrode and the base material to melt the metals at the welding point. They can use either direct (DC) or alternating (AC) current, and consumable or non consumable electrodes.… …
69Gamma ray — Gamma rays (denoted as gamma;) are a form of electromagnetic radiation or light emission of frequencies produced by sub atomic particle interactions, such as electron positron annihilation or radioactive decay. Gamma rays are generally… …
70ARONS, LEO — (1860–1919), German physicist and Social Democrat. The son of a wealthy Berlin banker, he became an assistant at the Institute of Physics and a Privatdozent in Strasbourg (1888–90) and Berlin (1890–1900). Because of his political convictions and… …
