continuous tube-rolling mill
41Mathematics and Physical Sciences — ▪ 2003 Introduction Mathematics Mathematics in 2002 was marked by two discoveries in number theory. The first may have practical implications; the second satisfied a 150 year old curiosity. Computer scientist Manindra Agrawal of the… …
42Forging — This article is about the metalworking process. For specific hot forging hearth, see forge. For the act of counterfeiting, see forgery. Hot metal ingot being loaded into a hammer forge Forging is a manufacturing process involving the shaping of… …
43Potrero Point — San Francisco is the location of the earliest and most important industrial facilities in the Western United States on the eastern extension of San Francisco s Potrero Hill, a natural land mass extending into San Francisco Bay south of Mission… …
44Swaging — (  /ˈsweɪ …
45Alternating current — (green curve). The horizontal axis measures time; the vertical, current or voltage. In alternating current (AC, also ac) the movement of electric charge periodically reverses direction. In direct current (DC, also dc), the flow of electric charge …
46Wire — For other uses, see Wire (disambiguation). Wires overhead A wire is a single, usually cylindrical, flexible strand or rod of metal. Wires are used to bear mechanical loads and to carry electricity and telecommunications signals. Wire is commonly… …
47London — /lun deuhn/, n. 1. Jack, 1876 1916, U.S. short story writer and novelist. 2. a metropolis in SE England, on the Thames: capital of the United Kingdom. 3. City of, an old city in the central part of the former county of London: the ancient nucleus …
48Horsepower — hp redirects here. For other uses, see HP (disambiguation). Horsepower (HP) is the name of several units of measurement of power. The most common definitions equal between 735.5 and 750 watts.[1] Horsepower was originally defined to compare the… …
49Union Railroad (Pittsburgh, Pennsylvania) — Infobox SG rail railroad name=Union Railroad logo filename=Union Railroad %28Pittsburgh%29 Logo.gif logo size= old gauge= marks=URR locale=North Bessemer, Munhall, Homestead, McKeesport, West Mifflin, Clairton, Bessemer, Riverton start year=1896… …
50Timeline of Russian inventions and technology records — The Hall of Space Technology in the Tsiolkovsky State Museum of the History of Cosmonautics, Kaluga, Russia. The exhibition includes the models and replicas of the following Russian inventions: the first satellite, Sputnik 1 (a ball under the… …
