superposed gear pair

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Mathematics 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… … Universalium
Compound locomotive — For the principles and other applications of the compound steam engine, see compound engine. De Glehn redirects here. For people and places named Glehn, de Glehn or von Glehn, see Glehn. A compound locomotive is a steam locomotive or engine unit… … Wikipedia
Western architecture — Introduction history of Western architecture from prehistoric Mediterranean cultures to the present. The history of Western architecture is marked by a series of new solutions to structural problems. During the period from the… … Universalium

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