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snorkel

(Encyclopedia)snorkel, tube through which a submarine or diver can draw air while underwater. When in use, the top of the snorkel tube extends above the water surface into the air. The first snorkels were probably ...

canal

(Encyclopedia)canal, an artificial waterway constructed for navigation or for the movement of water. The digging of canals for irrigation probably dates back to the beginnings of agriculture, and traces of canals h...

Thorfinn Karlsefni

(Encyclopedia)Thorfinn Karlsefni thôrˈfĭn kärlˈsĕvnē [key], fl. 1002–15, Norse leader of an attempt to colonize North America. He appeared in Greenland in 1002 and married Gudrid, widow of one of the sons ...

Vidal, Gore

(Encyclopedia)Vidal, Gore (Eugene Luther Gore Vidal, Jr.), 1925–2012, American writer, b. West Point, N.Y. He grew up in Washington, D.C., where a formative influence was his witty and scholarly grandfather, Sena...

Confederate cruisers

(Encyclopedia)Confederate cruisers, in U.S. history, warships constituting the South's seagoing navy. At the outbreak of the Civil War the United States ranked next to Great Britain in merchant marine. Since almost...

De Long, George Washington

(Encyclopedia)De Long, George Washington də lôngˈ [key], 1844–81, American arctic explorer, b. New York City, grad. Annapolis, 1865. In 1873 he was assigned to the Juniata, which was sent to the arctic to sear...

Fort Sumter

(Encyclopedia)Fort Sumter, fortification, built 1829–60, on a shoal at the entrance to the harbor of Charleston, S.C., and named for Gen. Thomas Sumter; scene of the opening engagement of the Civil War. Upon pass...

sonar

(Encyclopedia)sonar sōˈnär [key], device used underwater for locating submerged objects and for submarine communication by means of sound waves. The term sonar is an acronym for sound navigation ranging. The mai...

Cabot, Sebastian

(Encyclopedia)Cabot, Sebastian, b. 1483–86?, d. 1557, explorer in English and Spanish service; son of John Cabot. He may well have accompanied his father on the 1497 and 1498 voyages, and he was for many years gi...

navigation satellite

(Encyclopedia)navigation satellite, artificial satellite designed expressly to aid the navigation of sea and air traffic. Early navigation satellites, from the Transit series launched in 1960 to the U.S. navy's Nav...