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Cierva, Juan de la

(Encyclopedia)Cierva, Juan de la hwän dā lä thyārˈvä [key], 1895–1936, Spanish aeronautical engineer, inventor of a rotary-wing aircraft called an autogiro. He flew his first autogiro in 1923 and crossed th...

Marly-le-Roi

(Encyclopedia)Marly-le-Roi märlēˈ-lə-rwä [key], town (1990 pop. 16,775), Yvelines dept., N France, on the Seine River near Versailles. Nearby is the hamlet of Marly-la-Machine, where in 1682 a huge hydraulic e...

flywheel

(Encyclopedia)flywheel, heavy metal wheel attached to a drive shaft, having most of its weight concentrated at the circumference. Such a wheel resists changes in speed and helps steady the rotation of the shaft whe...

Benz, Karl

(Encyclopedia)Benz, Karl bĕnts [key], 1844–1929, German engineer, credited with building the first automobile powered by an internal-combustion engine. The car, driven in Mannheim in 1885 and patented in 1886, h...

governor, device

(Encyclopedia)governor, automatic device used to regulate and control such variables as speed or pressure in the functioning of an engine or other machine. A governor may be an electric, hydraulic, or mechanical de...

Fitch, John

(Encyclopedia)Fitch, John, 1743–98, American inventor, b. Windsor, Conn. Fitch began (1785) work on the invention of the steam engine and steamboat and secured soon afterward the exclusive right to build and oper...

truck

(Encyclopedia)truck, automotive vehicle designed primarily for the transportation of goods. A truck is constructed on the general lines of the automobile but uses larger and heavier parts. It may be powered by a ga...

commutator

(Encyclopedia)commutator, device used in an electric generator to convert the alternating current produced in the generator into direct current before the current is sent into an external circuit; it is basically a...

Heron of Alexandria

(Encyclopedia)Heron of Alexandria hērˈŏn [key] or Hero, mathematician and inventor. The dates of his birth and death are unknown; conjecture places them between the 2d cent. b.c. and the 3d cent. a.d. He is beli...

catalytic converter

(Encyclopedia)catalytic converter: see internal-combustion engine. ...