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stereoscope

(Encyclopedia)stereoscope stĕrˈēəskōpˌ [key], optical instrument that presents to a viewer two slightly differing pictures, one to each eye, to give the effect of depth. In normal vision the two eyes, being a...

Polke, Sigmar

(Encyclopedia)Polke, Sigmar, 1941–2011, innovative German artist best known for his paintings and photography. His family immigrated from East to West Germany in 1953, and he lived in Düsseldorf, studying (1961�...

oxalic acid

(Encyclopedia)oxalic acid ĕthˌāndīōĭk [key], HO2CCO2H, a colorless, crystalline organic carboxylic acid that melts at 189℃ with sublimation. Oxalic acid and oxalate salts are poisonous. Oxalic acid is found...

Colonsay

(Encyclopedia)Colonsay kŏlˈənzā [key], island, 17 sq mi (44 sq km), Argyll and Bute, NW Scotland, one of the Inner Hebrides. Crofting and cheese making are the main occupations. Colonsay is separated from Orons...

Westerly

(Encyclopedia)Westerly, town (1990 pop. 21,605), Washington co., extreme SW R.I., between the Pawcatuck River and Block Island Sound; inc. 1669. Formerly important industries include textile manufacturing (dating f...

Bell, Alexander Melville

(Encyclopedia)Bell, Alexander Melville, 1819–1905, Scottish-American educator, b. Edinburgh. Bell worked out a physiological or visible alphabet, with symbols that were intended to represent every sound of the hu...

di Suvero, Mark

(Encyclopedia)di Suvero, Mark dē so͞oˈvərō [key], 1933–, American sculptor, b. Shanghai. Di Suvero's major works are constructions of massize pieces of steel, huge weathered timbers, tires, chains, and rope....

Hyatt, John Wesley

(Encyclopedia)Hyatt, John Wesley, 1837–1920, American inventor, b. Starkey, N.Y. He is known especially for his development of celluloid; with his brothers, he began its manufacture in 1872. He also invented the ...

Burnham, Sherburne Wesley

(Encyclopedia)Burnham, Sherburne Wesley, 1838–1921, American astronomer, b. Thetford, Vt. After serving as observer at Dearborn Observatory, Chicago (1877–81, 1882–84), and as astronomer at Lick Observatory (...

Newcomb, Simon

(Encyclopedia)Newcomb, Simon no͞oˈkəm, nyo͞oˈ– [key], 1835–1909, American astronomer, b. Nova Scotia, grad. Lawrence Scientific School, Harvard, 1858. Living in the United States from 1853, he was appointe...