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Henry, Joseph

(Encyclopedia)Henry, Joseph, 1797–1878, American physicist, b. Albany, N.Y., educated at Albany Academy. He taught (1826–32) mathematics and natural philosophy at Albany Academy and was professor of natural phi...

Mead, George Herbert

(Encyclopedia)Mead, George Herbert mēd [key], 1863–1931, American philosopher and psychologist, b. South Hadley, Mass., grad. Oberlin, 1883, and Harvard, 1888, and studied in Leipzig and Berlin. He taught at the...

tuning systems

(Encyclopedia)tuning systems, methods for assigning pitches to the twelve Western pitch names that constitute the octave. The term usually refers to this procedure in the tuning of keyboard instruments. The need fo...

varnish

(Encyclopedia)varnish, homogeneous solution of gum or of natural or synthetic resins in oil (oil varnish) or in a volatile solvent (spirit varnish), which dries on exposure to air, forming a thin, hard, usually glo...

Catlin, George

(Encyclopedia)Catlin, George, 1796–1872, American traveler and artist, b. Wilkes-Barre, Pa. Educated as a lawyer, he practiced in Philadelphia for two years but turned to art study and became a portrait painter i...

Gansu

(Encyclopedia)Gansu or Kansu both: gänˈso͞oˈ [key], province, 141,000 sq mi (365,284 sq km), NW China. The capital is ...

acceleration

(Encyclopedia)acceleration, change in the velocity of a body with respect to time. Since velocity is a vector quantity, involving both magnitude and direction, acceleration is also a vector. In order to produce an ...

blackbody

(Encyclopedia)blackbody, in physics, an ideal black substance that absorbs all and reflects none of the radiant energy falling on it. Lampblack, or powdered carbon, which reflects less than 2% of the radiation fall...

alphorn

(Encyclopedia)alphorn or alpenhorn [Ger.,=Alps horn], wooden horn from 3 ft to 12 ft (91 cm–3.7 m) long, sometimes curved slightly, with conical bore and a cup-shaped mouthpiece. It produces only the natural harm...

Day, Thomas

(Encyclopedia)Day, Thomas, 1748–89, English social reformer and author. He supported the American Revolution and the abolition of slavery and was interested in improving the lot of the small farmer. His moralisti...