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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 ...

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 ...

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...

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...

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 ...

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. ...

scabies

(Encyclopedia)scabies skāˈbēz [key], highly contagious parasitic skin disease caused by the itch mite (Sarcoptes scabiei). The disease is also known as itch. It is acquired through close contact with an infested...

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...