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Sprengel, Christian Konrad

(Encyclopedia)Sprengel, Christian Konrad krĭsˈtyän kônˈrät shprĕngˈəl [key], 1750–1816, German botanist. Although director of a school at Spandau and tutor in Berlin, he devoted himself chiefly to the st...

loess

(Encyclopedia)loess lĕs, lōˈəs, Ger. lös [key], unstratified soil deposit of varying thickness, usually yellowish and composed of fine-grained angular mineral particles mixed with clay. It is found in many reg...

Van Allen radiation belts

(Encyclopedia)CE5 Van Allen radiation belts: The solar wind, a stream of protons, electrons, and ions coming from the sun, gives the belts their asymmetrical shape. Van Allen radiation belts, belts of radiation...

viol

(Encyclopedia)viol, family of bowed stringed instruments, the most important ensemble instruments from the 15th to the 17th cent. The viol's early history is indefinite, but it is recognizable in depictions from as...

sundial

(Encyclopedia)sundial, instrument that indicates the time of day by the shadow, cast on a surface marked to show hours or fractions of hours, of an object on which the sun's rays fall. Although any object whose sha...

ukulele

(Encyclopedia)ukulele yo͞okəlāˈlē [key], Hawaiian musical instrument developed from the Portuguese guitar. It has a fretted fingerboard and four strings that are plucked or strummed. Patented in 1917, the ukul...

instrumental

(Encyclopedia)instrumental, in the grammar of certain languages (e.g., Russian), the case referring to means or instrument. The Latin ablative may in some instances be termed instrumental. ...

lute

(Encyclopedia)CE5 Lute lute, musical instrument that has a half-pear-shaped body, a fretted neck, and a variable number of strings, which are plucked with the fingers. The long lute, with its neck much longer t...

reed organ

(Encyclopedia)reed organ, an organ in which air is forced over free reeds by means of bellows, usually worked by pedals. It is played by the use of one or more keyboards. Variations in tone are produced by stops th...

Kölreuter, Joseph Gottlieb

(Encyclopedia)Kölreuter or Koelreuter, Joseph Gottlieb both: yōˈzĕf gôtˈlēp kölˈroiˌtər [key], 1733–1806, German botanist. In 1764 he became professor of natural history and director of the botanical g...