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jet propulsion

(Encyclopedia)CE5 Types of jet engines: In the propeller-driven turbine a stream of high-velocity gases provides the power to drive the turbine and turn the propeller. In the jet-driven turbine the stream of gas...

hydria

(Encyclopedia)hydria hīˈdrēə [key], ancient Greek water jar with three handles—two lateral for lifting, a third vertical for pouring. In shape it was similar to the amphora, the early form having a narrower s...

Northrop, John Knudson

(Encyclopedia)Northrop, John Knudson, 1895–1981, American aviation pioneer, inventor, and executive, b. Newark, N.J. He worked for the Loughead Aircraft Manufacturing Co. (1916–20) as a draftsman, designing sea...

Lockheed, Allan Haines

(Encyclopedia)Lockheed, Allan Haines, 1889–1969, American aviation pioneer, b. Niles, Calif., as Allan Loughead. He worked as a mechanic and a race car driver, then, following his first flight (1910), he became a...

Fokker, Anthony

(Encyclopedia)Fokker, Anthony fôkˈər [key], 1890–1939, Dutch-American aircraft manufacturer, b. Kediri, Java, as Anton Herman Gerard Fokker. He established aircraft factories in Germany before World War I and ...

boring mill

(Encyclopedia)boring mill, machine tool used to increase the size of a hole previously made in a workpiece, usually with the purpose of obtaining a required degree of finish and accuracy in the final hole. In a hor...

Shiloh, battle of

(Encyclopedia)Shiloh, battle of, Apr. 6–7, 1862, one of the great battles of the American Civil War. The battle took its name from Shiloh Church, a meetinghouse c.3 mi (5 km) SSW of Pittsburg Landing, which was a...

skydiving

(Encyclopedia)skydiving, sport of descending partly by parachute from an airplane or similar craft. Engaged in for both recreational and competitive purposes, skydiving involves three phases of activity: the free f...

Tupolev, Andrei Nikolayevich

(Encyclopedia)Tupolev, Andrei Nikolayevich əndrāˈ nyĭkəlīˈəvĭch to͞opōˈlĕf [key], 1888–1972, Soviet aeronautical engineer, educated at the Moscow Technical Institute. In 1918 he helped organize the C...

marine engine

(Encyclopedia)marine engine, machine for the propulsion of watercraft. The earliest marine power plants, reciprocating steam engines, were used almost exclusively until the early 1900s. In later ship construction t...