mercury-arc tube
31lamp — n 1. illuminant, luminary, luminant, illumination; light, light vessel, lampad; lamplet, gas lamp, oil lamp, Carcel lamp, Argand lamp, petane lamp, Hefner lamp; table lamp, floor lamp, bridge lamp, music lamp, piano lamp, night light, picture… …
32Glass-to-metal seal — Glass to metal seals are a very important element of the construction of vacuum tubes, electric discharge tubes, incandescent light bulbs, glass encapsulated semiconductor diodes, reed switches, pressure tight glass windows in metal cases, and… …
33Germicidal lamp — A germicidal lamp is a special type of lamp which produces ultraviolet light (UVC). This short wave ultraviolet light ionizes oxygen to produce ozone and can kill many surface pathogens.There are two common types available:* Low pressure lamps *… …
34History of film — This article is about the history of cinema. For other uses, see History of photography. Years in film 1870s 1880s 1890s …
35Peter Cooper Hewitt — Infobox Scientist name = Peter Cooper Hewitt box width = image width =150px caption = Peter Cooper Hewitt birth date = May 5, 1861 birth place = New York City death date = August 25, 1921 death place = residence = citizenship = nationality =… …
36rare-earth element — /rair errth /, Chem. any of a group of closely related metallic elements, comprising the lanthanides, scandium, and yttrium, that are chemically similar by virtue of having the same number of valence electrons. Also called rare earth metal. [1955 …
37John Ambrose Fleming — Infobox Scientist name = Sir J. Ambrose Fleming caption = birth name = John Ambrose Fleming birth date = birth date|1849|11|29|mf=y birth place = Lancaster, Lancashire, England death date = death date and age|1945|4|18|1849|11|29|mf=y death place …
38Niobium — zirconium ← niobium → molybdenum V ↑ Nb ↓ Ta …
39electric discharge lamp — or vapor lamp Lighting device consisting of a transparent container within which a gas is energized by an applied voltage and made to glow. After practical generators were devised in the 19th century, many experimenters applied electric power to… …
40lamp — Synonyms and related words: Chinese lantern, Finsen light, Moore light, arc light, battery lamp, broadside, candle, candlelight, cresset, dark lantern, electric candle, electric lamp, electric light bulb, electric torch, electric arc lamp,… …
