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Useful english dictionary. 2012.
Geissler, Heinrich — ▪ German glassblower in full Johann Heinrich Wilhelm Geissler born May 26, 1815, Igelshieb, Thuringia, Saxe Meiningen [Germany] died January 24, 1879, Bonn, Prussia [Germany] German glassblower for whom the Geissler (mercury) pump and… … Universalium
pump — I (New American Roget s College Thesaurus) v. t. draw, suck [out]; interrogate, question, catechize; inflate, puff up. See inquiry, wind, extraction. II (Roget s IV) n. Types of pumps include: air, chain, force, Geissler, lift, mercury, sand,… … English dictionary for students
Vacuum pump — A vacuum pump is a device that removes gas molecules from a sealed volume in order to leave behind a partial vacuum. The vacuum pump was invented in 1650 by Otto von Guericke. Types Pumps can be broadly categorized according to three… … Wikipedia
Vacuum pump — Vacuum Vac u*um, n.; pl. E. {Vacuums}, L. {Vacua}. [L., fr. vacuus empty. See {Vacuous}.] 1. (Physics) A space entirely devoid of matter (called also, by way of distinction, absolute vacuum); hence, in a more general sense, a space, as the… … The Collaborative International Dictionary of English
Heinrich Geißler — Infobox Scientist name = Heinrich Geißler box width = image width =150px caption = Heinrich Geißler birth date = May 26 1814 birth place = Igelshieb, Thuringia, Saxe Meiningen death date = January 24 1879 death place = residence = citizenship =… … Wikipedia
Vacuum — 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… … Wikipedia
Fluorescent lamp — A fluorescent lamp or fluorescent tube is a gas discharge lamp that uses electricity to excite mercury vapor. The excited mercury atoms produce short wave ultraviolet light that then causes a phosphor to fluoresce, producing visible light.Unlike… … Wikipedia
Cathode ray — Cathode rays (also called an electron beam or e beam) are streams of electrons observed in vacuum tubes, i.e. evacuated glass tubes that are equipped with at least two electrodes, a cathode (negative electrode) and an anode (positive electrode)… … Wikipedia
Neon sign — … Wikipedia
Crookes tube — A Crookes tube. The electrons travel in straight lines from the cathode on the left, shown by the shadow cast by the cross on the fluorescence on the righthand wall. The anode is at the bottom. A Crookes tube is an early experimental electrical… … Wikipedia
