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Balen, Hendrik van

(Encyclopedia)Balen, Hendrik van hĕnˈdrĭk vän bäˈlən [key], 1575–1632, Flemish painter, b. Antwerp. Van Balen usually provided the figures for scenes in which another painter, frequently Jan Brueghel, desi...

Orley, Bernard van

(Encyclopedia)Orley, Bernard van bäˈrənt [key], c.1491–1542, Flemish painter. In 1515 he was settled in Brussels, where he became court painter to Margaret of Austria, regent of the Netherlands, and to her suc...

Ostade, Adriaen van

(Encyclopedia)Ostade, Adriaen van äˈdrēän vän ôˈstädə [key], 1610–85, Dutch genre painter, b. Haarlem. Trained in the studio of Frans Hals, he was strongly influenced by his fellow student Adriaen Brouwe...

pulley

(Encyclopedia)CE5 Pulleys: The mechanical advantage (MA) of a system of pulleys is equal to the number of supporting strands: in A MA=1 and in B MA=2. pulley, simple machine consisting of a wheel over which a r...

trade winds

(Encyclopedia)trade winds, movement of air toward the equator, from the NE in the Northern Hemisphere and from the SE in the Southern Hemisphere. The trade winds originate on the equatorial sides of the horse latit...

nebula

(Encyclopedia)nebula nĕbˈyo͝olə [key] [Lat.,=mist], in astronomy, observed manifestation of a collection of highly rarefied gas and dust in interstellar space. Prior to the 1960s this term was also applied to b...

Chittenden, Thomas

(Encyclopedia)Chittenden, Thomas chĭtˈəndən [key], 1730–97, governor of Vermont, b. East Guilford, Conn. After moving to Vermont in 1774, he was active in the Windsor Convention, which declared (1777) Vermont...

actinometer

(Encyclopedia)actinometer ăkˌtənŏmˈətər [key], instrument used to measure the heating power of radiation. Actinometers are used chiefly in meteorology to measure solar radiation as transmitted directly by th...

bolometer

(Encyclopedia)bolometer bōlŏmˈətər, bə– [key], instrument for detecting and measuring radiation, e.g., visible light, infrared radiation, and ultraviolet radiation, in amounts as small as one millionth of a...

Green Mountain Boys

(Encyclopedia)Green Mountain Boys, popular name of armed bands formed (c.1770) under the auspices of Ethan Allen in the Green Mountains of what is today Vermont. Their purpose was to prevent the New Hampshire Grant...