evacuated bulb
11lamp — lampless, adj. /lamp/, n. 1. any of various devices furnishing artificial light, as by electricity or gas. Cf. fluorescent lamp, incandescent lamp. 2. a container for an inflammable liquid, as oil, which is burned at a wick as a means of… …
12Joseph Swan — Infobox Scientist name = Joseph Wilson Swan box width = image size =200px caption =Photograph of Swan, c.1900 birth date = Birth date|1828|10|31 birth place = Bishopwearmouth, England death date = Death date and age|1914|5|27|1828|10|31 death… …
13spectroscopy — spectroscopist /spek tros keuh pist/, n. /spek tros keuh pee, spek treuh skoh pee/, n. the science that deals with the use of the spectroscope and with spectrum analysis. [1865 70; SPECTRO + SCOPY] * * * Branch of analysis devoted to identifying… …
14Maglev — JR Maglev at Yamanashi, Japan test track in November 2005 …
15digestive system, human — Introduction the system used in the human body for the process of digestion. The human digestive system consists primarily of the digestive tract (alimentary canal), or the series of structures and organs through which food and liquids pass… …
16Swan, Sir Joseph Wilson — ▪ English physicist and chemist born Oct. 31, 1828, Sunderland, Durham, Eng. died May 27, 1914, Warlingham, Surrey English physicist and chemist who produced an early electric light bulb and invented the dry photographic plate, an important… …
17Mercury-arc valve — Mercury rectifier on display in Beromünster, Switzerland before being decommissioned A mercury arc valve (mercury vapor rectifier) is a type of electrical rectifier used for converting high voltage or high current alternating current (AC) into… …
18Vacuum — This article is about empty physical space or the absence of matter. For other uses, see Vacuum (disambiguation). Free space redirects here. For other uses, see Free space (disambiguation). Pump to demonstrate vacuum In everyday usage, vacuum is… …
19Mercury arc valve — A mercury arc valve (mercury vapor rectifier) is a type of electrical rectifier which converts alternating current into direct current. Rectifiers of this type were used in electric motor power supplies for industry, in electric… …
20incandescent lamp — Tungsten lamp Tung sten lamp An electric glow lamp having filaments of metallic tungsten, and contained in a glass bulb which is evacuated or has an inert gas, to avoid oxidation of the tungsten; a common form of light bulb. Such lamps, owing to… …
