electrical discharge machines
81photography, technology of — Introduction equipment, techniques, and processes used in the production of photographs. The most widely used photographic process is the black and white negative–positive system (Figure 1 >). In the camera the lens projects an image of… …
82Ozone — For other uses, see Ozone (disambiguation). Ozone …
83Van de Graaff generator — A Van de Graaff generator is an electrostatic machine which uses a moving belt to accumulate very high electrostatically stable voltages on a hollow metal globe. The potential differences achieved in modern Van de Graaff generators can reach 5… …
84Filling station — The still operating Skovshoved Filling Station from 1935 in Copenhagen, Denmark, designed by Arne Jacobsen …
85ship — shipless, adj. shiplessly, adv. /ship/, n., v., shipped, shipping. n. 1. a vessel, esp. a large oceangoing one propelled by sails or engines. 2. Naut. a. a sailing vessel square rigged on all of three or more masts, having jibs, staysails, and a… …
86United States — a republic in the N Western Hemisphere comprising 48 conterminous states, the District of Columbia, and Alaska in North America, and Hawaii in the N Pacific. 267,954,767; conterminous United States, 3,022,387 sq. mi. (7,827,982 sq. km); with… …
87Glossary of environmental science — This is a glossary of environmental science.Environmental science is the study of interactions among physical, chemical, and biological components of the environment. Environmental science provides an integrated, quantitative, and… …
88Motor-generator — Radio station motor generator set, converting from low to the high voltage power supply. This device is called an umformer in German. Dübendorf Museum of Military Aviation A motor generator (an M G set or a dynamotor for dynamo motor) is a device …
89Timeline of electromagnetism — The timeline of electromagnetism, that is the timeline of the human understanding of electromagnetic forces, dates back over two thousand years ago. It lists, within the history of electromagnetism, the associated theories, technology, and events …
90Snow blower — A snow blower, snowblower, or snow thrower is a machine for removing snow from an area where it is not wanted, such as a driveway, sidewalk, roadway, or runway. It can use either electric power, or a gasoline or diesel engine to throw snow to… …
