pool cathode
21Allen B. DuMont — Allen Balcom DuMont Born January 29, 1901(1901 01 29) Brooklyn, New York City, New York, U.S. Died 14 November 1965 …
22printing — /prin ting/, n. 1. the art, process, or business of producing books, newspapers, etc., by impression from movable types, plates, etc. 2. the act of a person or thing that prints. 3. words, symbols, etc., in printed form. 4. printed material. 5.… …
23History of electromagnetism — The history of electromagnetism, that is the human understanding and recorded use of electromagnetic forces, dates back over two thousand years ago, see Timeline of electromagnetism. The ancients must have been acquainted with the effects of… …
24Clark cell — (1897) The Clark cell, invented by English engineer Josiah Latimer Clark in 1873, is a wet chemical cell (colloquially: battery) that produces a highly stable voltage usable as a laboratory standard. Contents …
25Thyratron — A thyratron is a type of gas filled tube used as a high energy electrical switch and controlled rectifier. Triode, Tetrode and Pentode variations of the thyratron have been manufactured in the past, though most are of the triode design. Gases… …
26ignitron — /ig nuy tron, ig ni tron/, n. Electronics. a cathode arc vacuum tube with an auxiliary electrode projecting into a pool of mercury: it conducts current when the anode is positive. [1930 35; IGNI(TER) + TRON] * * * ▪ electronics electron… …
27Nuclear reprocessing — technology was developed to chemically separate and recover fissionable plutonium from irradiated nuclear fuel.[1] Reprocessing serves multiple purposes, whose relative importance has changed over time. Originally reprocessing was used solely to… …
28electromagnetic radiation — Physics. radiation consisting of electromagnetic waves, including radio waves, infrared, visible light, ultraviolet, x rays, and gamma rays. [1950 55] * * * Energy propagated through free space or through a material medium in the form of… …
29flight, history of — ▪ aviation Introduction development of heavier than air flying machines. Important landmarks and events along the way to the invention of the airplane include an understanding of the dynamic reaction of lifting surfaces (or wings), building… …
30zinc processing — Introduction preparation of the ore for use in various products. Zinc (Zn) is a metallic element of hexagonal close packed (hcp) crystal structure and a density of 7.13 grams per cubic centimetre. It has only moderate hardness and can …
