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Cartwright, Peter

(Encyclopedia)Cartwright, Peter, 1785–1872, American Methodist preacher, b. Virginia. He was a circuit rider in Kentucky, Tennessee, Indiana, Ohio, and Illinois for nearly 50 years. In 1846 he was defeated as a c...

mass spectrograph

(Encyclopedia)mass spectrograph, device used to separate electrically charged particles according to their masses; a form of the instrument known as a mass spectrometer is often used to measure the masses of isotop...

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...

reggae

(Encyclopedia)reggae, Jamaican popular music that developed in the 1960s among Kingston's poor blacks, drawing on American “soul” music and traditional African and Jamaican folk music and ska (a Jamaican and Br...

Dillon, John Forrest

(Encyclopedia)Dillon, John Forrest, 1831–1914, American jurist, b. Montgomery co., N.Y., M.D. State Univ. of Iowa, 1850. He abandoned medical practice early in his career and was admitted to the Iowa bar in 1852....

Allison, Bobby

(Encyclopedia)Allison, Bobby (Robert Arthur Allison), 1937–, American auto racing driver, b. Miami, Fla. The hard-charging Allison drove the National Association for Stock Car Auto Racing circuit from 1965 to 198...

welding

(Encyclopedia)welding, process for joining separate pieces of metal in a continuous metallic bond. Cold-pressure welding is accomplished by the application of high pressure at room temperature; forge welding (forgi...

generator

(Encyclopedia)CE5 Generator: The rotation of the conducting coil of wire in a magnetic field causes a current to be induced in the coil. This current is alternating and is conducted from the coil by means of sli...

Moissan, Henri Ferdinand Frederick

(Encyclopedia)Moissan, Henri Ferdinand Frederick, 1852–1907, French chemist, Ph.D. École Pratique des Haute Études, Paris, 1880. Moissan was a professor at the School of Pharmacy in Paris (1886–1900) and at t...

Siemens, Ernst Werner von

(Encyclopedia)Siemens, Ernst Werner von ĕrnst vĕrˈnər fən zēˈməns [key], 1816–92, German electrical engineer and inventor. He was a founder and director of Siemens and Halske, a firm that made electrical ...