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vacuum cleaner

(Encyclopedia)vacuum cleaner, mechanical device using a draft of air to remove dust, loose dirt, or other particulate matter from dry surfaces. It is especially useful on highly textured surfaces, such as carpets a...

Tlemcen

(Encyclopedia)Tlemcen tlĕmsĕnˈ [key], city (1998 pop. 155,162), NW Algeria, capital of Tlemcen prov. Its location on a crossroads between the Mediterranean coast and the Sahara and between Algeria and Morocco ha...

Pulcheria

(Encyclopedia)Pulcheria pəlkērˈēə [key], 399–453, Roman empress of the East (414–53), daughter of Arcadius and Eudoxia. She became coruler with her brother, Theodosius II, and regent in 414. Theodosius rem...

Young, Charles Augustus

(Encyclopedia)Young, Charles Augustus, 1834–1908, American astronomer, b. Hanover, N.H., grad. Dartmouth, 1853. He discovered the reversing layer of the solar atmosphere and proved the gaseous nature of the sun's...

San Germán

(Encyclopedia)San Germán sän hārmänˈ [key], town (1990 pop. 34,962), SW Puerto Rico, in an agricultural area producing coffee, sugar, tobacco, and fruit. The original village was founded in 1511, but it was ea...

weather

(Encyclopedia)weather, state of the atmosphere at a given time and place with regard to temperature, air pressure (see barometer), wind, humidity, cloudiness, and precipitation. The term weather is restricted to co...

David and Lucile Packard Foundation

(Encyclopedia)David and Lucile Packard Foundation, private philanthropic institution that funds nonprofit organizations. It was founded in 1964 by David Packard (1912–96), co-founder of Hewlett-Packard Co., and h...

haze

(Encyclopedia)haze, suspension in the atmosphere of minute dust or salt particles that are not individually seen but that nevertheless reduce visibility. So-called damp haze and dry haze produce different optical e...

Flammarion, Camille

(Encyclopedia)Flammarion, Camille kämēˈyə flämäryôNˈ [key], 1842–1925, French astronomer and author. He served for some years at the Paris Observatory and the Bureau of Longitudes, and in 1883 he set up a...

Nassau, city, Bahamas

(Encyclopedia)Nassau năˈsô [key], city (1990 pop. 172,196), capital of the Bahamas. A port on New Providence island, it has a large and beautiful harbor and is the commercial and social center of the islands. It...