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Croydon
Croydon outer borough (1991 pop. 299,600) of Greater London, SE England. It is London's second largest shopping and cultural center after West End. London's first airport, the Croydon Aerodrome, was constructed there in 1915 but closed in 1959 after Heathrow was built. Scientific instruments, inter...
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arch
arch the spanning of a wall opening by means of separate units (such as bricks or stone blocks) assembled into an upward curve that maintains its shape and stability through the mutual pressure of a load and the separate pieces. The weight of the supported load is thus converted into downward and o...
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turnpike
turnpike road paid for partly or wholly by fees collected from travelers at tollgates. It derives its name from the hinged bar that prevented passage through such a gate until the toll was paid. See also road .
Development of Turnpike Roads
In England tollgates were first authorized by l...
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George Willis Ritchey
George Willis Ritchey 1864-1945, American astronomer, b. Meigs co., Ohio, studied at the Univ. of Cincinnati (1883-84, 1886-87). He was superintendent of instrument construction (1899-1904) at Yerkes Observatory and then (1905-9) was associated with the Solar Observatory of Carnegie Institution. Fr...
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Perth
Perth city (1991 pop. 1,018,702), capital of Western Australia, SW Australia, on the Swan River estuary. Fremantle is Perth's port. Perth is a communications and transportation center and the state's financial, commercial, and cultural hub. The suburbs of Fremantle, Kwinana, and Welshpool have heav...
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cofferdam
cofferdam temporary barrier for excluding water from an area that is normally submerged. Made commonly of wood, steel, or concrete sheet piling (see pile ), cofferdams are used in constructing the foundations of dams, bridges, and similar subaqueous structures and for temporary drydocks. If double...
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Aberystwyth
Aberystwyth , town (1991 pop. 10,250), Ceredigion, W Wales, on Cardigan Bay. It is a summer resort and cultural center. Before the construction of railroads, Aberystwyth was a coastal trading center. The town is the seat of a constituent institution of the Univ. of Wales and of the National Library ...
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Ames
Ames city (1990 pop. 47,198), Story co., central Iowa, on the Skunk River; inc. 1870. Its chief manufactures are electronic, water-analysis, and water-treatment equipment; motor vehicles; construction materials; and machinery. Iowa State Univ. is located in Ames and contributes significantly to the...
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Fort Sam Houston
Fort Sam Houston U.S. army base, 3,300 acres (1,335 hectares), S Tex., in San Antonio; headquarters of the Fifth Army. San Antonio, long a military center, donated land in 1870 for the site of a permanent military post that was constructed from 1876 to 1890 and named for Gen. Sam Houston. The famou...
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Sir William Cornelius Van Horne
Sir William Cornelius Van Horne 1843-1915, president (1888-99) and chairman of the board (1899-1915) of the Canadian Pacific Railway, b. Illinois. He worked on U.S. railways before becoming (1881), on the recommendation of James J. Hill, general manager of the Canadian Pacific Railway. He supervise...
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