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disk plow

(Encyclopedia)disk plow or disk, farm implement employing a row or rows of concave circular steel disks that cut and pitch the soil in a way somewhat similar to a moldboard plow. It can be used in many situations w...

icebreaker

(Encyclopedia)icebreaker, ship of special hull design and wide beam, with relatively flat bottom, designed to force its way through ice. When the icebreaker charges into the ice at full speed, its sharply inclined ...

Athabasca, Lake

(Encyclopedia)Athabasca, Lake, fourth largest lake of Canada, c.3,120 sq mi (8,100 sq km), c.200 mi (320 km) long and from 5 to 35 mi (8–56 km) wide, NE Alta., and SW Sask., at the edge of the Canadian Shield. A ...

Cowper, William

(Encyclopedia)Cowper, William ko͞oˈpər, kouˈ– [key], 1731–1800, English poet. Physically and emotionally unfit for the professional life, he was admitted to the bar but never practiced. After a battle with ...

quartz

(Encyclopedia)quartz, one of the commonest of all rock-forming minerals and one of the most important constituents of the earth's crust. Chemically, it is silicon dioxide, SiO2. It occurs in crystals of the hexagon...

Casiphia

(Encyclopedia)Casiphia kāsĭfˈēə, kăsĭfīˈə [key], in the Bible, place, on the way from Babylon to Jerusalem. ...

Mistassini, Lake

(Encyclopedia)Mistassini, Lake, c.840 sq mi (2,180 sq km), S Que., Canada, NW of Lake St. John, in sparsely settled country. It drains W to James Bay by way of the Rupert River (380 mi/612 km long). ...

Via Appia

(Encyclopedia)Via Appia: see Appian Way; Roman roads. ...

control systems

(Encyclopedia)control systems, combinations of components (electrical, mechanical, thermal, or hydraulic) that act together to maintain actual system performance close to a desired set of performance specifications...

Bonus Marchers

(Encyclopedia)Bonus Marchers, in U.S. history, more than 20,000 veterans, most of them unemployed and in desperate financial straits, who, in the spring of 1932, spontaneously made their way to Washington, D.C. The...