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shaduf

(Encyclopedia)shaduf or shadoof both: shədo͝ofˈ, shäˈdo͝of [key], primitive device used to lift water from a well or stream for irrigation purposes. Essentially the device consists of a long boom balanced acr...

Devils Lake

(Encyclopedia)Devils Lake. 1 200 sq mi (520 sq km), NE central N.Dak., the largest natural body of water in the state. In an area of typically inland drainage, Devils Lake can range from a dry lakebed to more than ...

dipper

(Encyclopedia)dipper, common name for the only aquatic member of the order Perciformes (perching birds) found near cold mountain streams. With their short, stubby wings and tails and their thick brownish plumage, d...

archerfish

(Encyclopedia)archerfish, laterally compressed fish, genus Toxotes, which catches insects by spitting at and disabling them. The archerfish has a groove in the roof of its mouth that forms a long narrow tube when t...

personal watercraft

(Encyclopedia)personal watercraft (PWC), a lightweight vessel usually less than 16 ft (5 m) long that uses an inboard water jet pump, powered by an internal-combustion engine, as its primary source of propulsion. T...

reclamation of land

(Encyclopedia)reclamation of land, practice of converting land deemed unproductive into arable land by such methods as irrigation, drainage, flood control, altering the texture and mineral and organic content of so...

Minnehaha Falls

(Encyclopedia)Minnehaha Falls mĭnˌēhäˈhä [key] [laughing water], 53 ft (16.1 m) high, SE Minn., in Minnehaha Creek, which flows from Lake Minnetonka (23 sq mi/60 sq km) SE to the Mississippi River. The surrou...

McNary Dam

(Encyclopedia)McNary Dam, 7,265 ft (2,214 m) long and 183 ft (56 m) high, on the Columbia River between Oregon and Washington, near Umatilla, Oreg.; built 1947–56 by the U.S. Corps of Engineers. Located at the he...

Savery, Thomas

(Encyclopedia)Savery, Thomas, c.1650–1715, English engineer. He became a military engineer, rising to the rank of captain by 1702. He spent his free time performing experiments in mechanics, inventing such device...

depth charge

(Encyclopedia)depth charge, explosive device used against submarines and other underwater targets, either rolled into the water from rails on the stern of a ship or propelled from depth charge throwers. The charge ...