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blister

(Encyclopedia)blister, puffy swelling of the outer skin (epidermis) caused by burn, friction, or irritants like poison ivy. A response of the body to protect deeper tissue, blisters generally contain serum, the liq...

still

(Encyclopedia)still, term applied to the apparatus used in distillation, referring either to the flask in which a liquid to be distilled is evaporated, or to other pieces of equipment, or to the entire apparatus. ...

Kroehl, Julius Hermann

(Encyclopedia)Kroehl, Julius Hermann, 1820–67, German-American inventor and engineer, b. Memel, Prussia (now Klaipeda, Lithuania). Immigrating in 1844 to the United States, he became an iron manufacturer and civi...

amphibole

(Encyclopedia)amphibole ămˈfəbōlˌ [key], any of a group of widely distributed rock-forming minerals, magnesium-iron silicates, often with traces of calcium, aluminum, sodium, titanium, and other elements. The ...

feldspar

(Encyclopedia)feldspar fĕlˈspär [key], an abundant group of rock-forming minerals which constitute 60% of the earth's crust. Chemically the feldspars are silicates of aluminum, containing sodium, potassium, iron...

clock

(Encyclopedia)CE5 A pendulum clock: Weight-driven clock mechanism clock, instrument for measuring and indicating time. Predecessors of the clock were the sundial, the hourglass, and the clepsydra. See also watc...

Alton

(Encyclopedia)Alton ôlˈtən [key], city, Madison co., SW Ill., on bluffs of the Mississippi River 5 mi (8.1 km) above its confluence with the Missouri; inc. 1837. Alton is a shipping ...

turquoise

(Encyclopedia)turquoise, hydrous phosphate of aluminum and copper, Al2(OH)3PO4·H2O+Cu, used as a gem. It occurs rarely in crystal form, but is usually cryptocrystalline. Turquoise is opaque and has a waxy luster; ...

automatic tuning control

(Encyclopedia)automatic tuning control (ATC), method or device to keep a radio or television receiver automatically tuned to a desired frequency or channel. Assuming that the receiver is at least approximately tune...

cast-iron architecture

(Encyclopedia)cast-iron architecture, a term used to designate buildings that incorporate cast iron for structural and/or decorative purposes. After 1800 cast-iron supports were exploited as an alternative to mason...