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conical surface

(Encyclopedia)conical surface: see cone.

conic section

(Encyclopedia)CE5 Conic sections conic section or conic kŏnˈĭk [key], curve formed by the intersection of a plane and a right circular cone (conical surface). The ordinary conic sections are the circle, the ...

Gray, Asa

(Encyclopedia)Gray, Asa, 1810–88, one of America's leading botanists and taxonomists, b. Oneida co., N.Y. As professor of natural history at Harvard from 1842, he was the teacher of many eminent botanists. Throug...

Sabalan

(Encyclopedia)Sabalan or Savalan säˌvəlänˈ [key], volcanic cone, 15,592 ft (4,752 m) high, NW Iran, near Ardebil. The prophet Zoroaster reputedly wrote the Avesta there. ...

In

(Encyclopedia)In, symbol for the element indium. ...

Damavand

(Encyclopedia)Damavand or Demavend both: dĕmˈəvĕnd [key], volcanic cone, 18,606 ft (5,671 m) high, in the Elburz range, N Iran. A permanently snow-covered volcano of recent geologic origin, it emits gases and s...

Clark, William Smith

(Encyclopedia)Clark, William Smith, 1826–86, American educator, b. Ashfield, Mass., grad. Amherst, 1848, and studied chemistry and botany at Göttingen (Ph.D., 1852). He taught at Amherst until the Civil War, fou...

Misti, El

(Encyclopedia)Misti, El ĕl mēˈstē [key], dormant volcano, c.19,150 ft (5,840 m) high, in the Cordillera Occidental, S Peru, rising over the city of Arequipa. El Misti is flanked by two other volcanos—on the N...

Britton, Nathaniel Lord

(Encyclopedia)Britton, Nathaniel Lord, 1859–1934, American botanist, grad. Columbia School of Mines, 1879. He taught geology and botany at Columbia, 1879–96. He was the New York Botanical Garden's first directo...

Eaton, Amos

(Encyclopedia)Eaton, Amos ēˈtən [key], 1776–1842, American naturalist, b. Chatham, N.Y., grad. Williams College, 1799. After practicing law for a time, he conducted pioneer geological surveys in Albany and Ren...