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luminism

(Encyclopedia)luminism lo͞oˈmĭnĭzˌəm [key], American art movement of the 19th cent. Luminism was an outgrowth of the Hudson River school. In its concern for capturing the effects of light and atmosphere it is...

Hopper, Edward

(Encyclopedia)Hopper, Edward, 1882–1967, American painter and engraver, b. Nyack, N.Y., studied in New York City with Robert Henri and other Ashcan School painters. Hopper lived in France for a year but was littl...

fog

(Encyclopedia)fog, aggregation of water droplets or ice crystals immediately above the surface of the earth (i.e., a cloud near the ground). A light or thin fog is usually called a mist. Fog may occur when the mois...

evaporimeter

(Encyclopedia)evaporimeter ĭvăpˌərĭmˈətər [key], instrument that measures the rate of evaporation of water into the atmosphere, sometimes called an atmometer. Evaporimeters are of two types, those that meas...

Porter, Katherine Anne

(Encyclopedia)Porter, Katherine Anne, 1890–1980, American author, b. Indian Creek, Tex., as Callie Russell Porter. Although she published infrequently, she is regarded as a master of the short story. Her first bo...

Borgia, Lucrezia

(Encyclopedia)Borgia, Lucrezia bōrˈjä [key], 1480–1519, Italian noblewoman, famous figure of the Italian Renaissance; daughter of Pope Alexander VI. Her first marriage (1492) to Giovanni Sforza of Pesaro was ...

Bjerknes, Vilhelm Frimann Koren

(Encyclopedia)Bjerknes, Vilhelm Frimann Koren vĭlˈhĕlm frēˈmän kôˈrən byĕrkˈnĕs [key], 1862–1951, Norwegian physicist and pioneer in modern meteorology. He worked on applying hydrodynamic and thermody...

air mass

(Encyclopedia)air mass, large body of air within the earth's atmosphere in which temperature and humidity, although varying at different heights, remain similar throughout the body at any one height. Air masses for...

white lead

(Encyclopedia)white lead, heavy, white substance, poisonous, insoluble in water, extensively used as a white pigment and base in paints. It is one of the oldest paint pigments used by humans. Chemically, it is basi...

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...