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Waters, Muddy

(Encyclopedia)Waters, Muddy, 1915–83, African-American blues singer and guitarist, b. Rolling Fork, Miss., as McKinley Morganfield. As a teenager he began singing and playing traditional country blues on harmonic...

ozone

(Encyclopedia)ozone ōˈzōn [key], an allotropic form of the chemical element oxygen (see allotropy). Pure ozone is an unstable, faintly bluish gas with a characteristic fresh, penetrating odor. The gas has a dens...

Hickory, city, United States

(Encyclopedia)Hickory, city (2020 pop. 43,490), Burke and Catawba counties, W N.C., at the foot of the Blue Ridge Mts.; inc. 1870. It is a processing and trade center...

Hadera

(Encyclopedia)Hadera hədāˈrä [key], town, W Israel, on the plain of Sharon, near the Mediterranean Sea. ...

Newcastle-under-Lyme

(Encyclopedia)Newcastle-under-Lyme, city (1991 pop. 73,208) and district, Staffordshire, W central England, on the Lyme River. Construction materials, apparel, computers, electric motors, and machinery are manufact...

tugboat

(Encyclopedia)tugboat, small, strongly built vessel, used to guide large oceangoing ships into and out of port and to tow barges, dredging and salvage equipment, and disabled vessels. Tugboats range in overall leng...

Adda

(Encyclopedia)Adda ädˈdä [key], river, 194 mi (312 km) long, rising in the Rhaetian Alps, N Italy, and flowing SW through Lake Como, then S into the Po River near Cremona. Its upper course furnishes much electri...

elevator, in machinery

(Encyclopedia)elevator, in machinery, device for transporting people or goods from one level to another. The term is applied to the enclosed structures as well as the open platforms used to provide vertical transpo...

xerography

(Encyclopedia)xerography zərŏgˈrəfēˌ [key], also called electrophotography, method of dry photocopying in which the image is transferred by using the attractive forces of electric charges. A beam of light, us...

solar cell

(Encyclopedia)solar cell, semiconductor devised to convert light to electric current. It is a specially constructed diode, usually made of forms of crystalline silicon or of thin films (as of copper indium gallium ...