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Purcell, Edward Mills

(Encyclopedia)Purcell, Edward Mills, 1912–97, American physicist, b. Taylorville, Ill., Ph.D. Harvard, 1938. During World War II, Purcell was a researcher at the Massachusetts Institute of Technology Radiation La...

Hertz, Heinrich Rudolf

(Encyclopedia)Hertz, Heinrich Rudolf hĕrts [key], 1857–94, German physicist. He confirmed J. C. Maxwell's electromagnetic theory and in the course of experiments (1886–89) produced and studied electromagnetic...

inductor

(Encyclopedia)inductor, electric device consisting of one or more turns of wire and typically having two terminals. An inductor is usually connected into a circuit in order to raise the inductance to a desired valu...

Stephens, James

(Encyclopedia)Stephens, James, 1882–1950, Irish poet and fiction writer, b. Dublin. One of the leading figures of the Irish literary renaissance, Stephens is best known for his fanciful and highly colored prose w...

stereophonic sound

(Encyclopedia)stereophonic sound, sound recorded simultaneously through two or more electronic channels. For live recordings, microphones are placed in different positions relative to the sound source. The recorded...

Brown, Jerry

(Encyclopedia)Brown, Jerry (Edmund Gerald Brown, Jr.), 1938–, American political leader, b. San Francisco. The son of Edmund Gerald (Pat) Brown (1905–96), governor of California (1959–67), Brown abandoned ear...

Williams, Hank

(Encyclopedia)Williams, Hank, 1923–53, American country singer and songwriter, b. near Georgiana, Ala., as Hiram Williams. He is widely regarded as the leading figure in the history of country music (see country ...

luminosity

(Encyclopedia)luminosity, in astronomy, the rate at which energy of all types is radiated by an object in all directions. A star's luminosity depends on its size and its temperature, varying as the square of the ra...

Mitchell, Maria

(Encyclopedia)Mitchell, Maria, 1818–89, American astronomer and educator, b. Nantucket, Mass. Mitchell taught school in Nantucket, and later became a librarian. On Oct. 1, 1847, Mitchell discovered a comet (1847 ...

Orbiting Astronomical Observatory

(Encyclopedia)Orbiting Astronomical Observatory (OAO), series of four orbiting observatories (see observatory, orbiting) launched between 1966 and 1972 by the National Aeronautics and Space Administration (NASA) to...