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vernier

(Encyclopedia)vernier vûrˈnēr [key], auxiliary scale, either straight or an arc of a circle, designed to slide along a fixed scale. Its unit divisions, usually smaller than those on the fixed scale, permit a far...

Mayer, Johann Tobias

(Encyclopedia)Mayer, Johann Tobias yōˈhän tōbēˈäs mīˈər [key], 1723–62, German mathematician and astronomer. In 1751 he became professor of economics and mathematics at the Univ. of Göttingen, and in 1...

xenon

(Encyclopedia)xenon zēˈnŏn [key] [Gr.,=strange], gaseous chemical element; symbol Xe; at. no. 54; at. wt. 131.293; m.p. −111.9℃; b.p. −107.1℃; density 5.86 grams per liter at STP; valence usually 0. Xeno...

Limpopo, river, S Africa

(Encyclopedia)Limpopo lĭmpōˈpō [key], river, c.1,100 mi (1,770 km) long, rising in Limpopo prov., South Africa. It flows in a great arc, first north (forming part of the South Africa–Botswana border), then ea...

parsec

(Encyclopedia)parsec pärˈsĕc [key] [parallax + second], in astronomy, basic unit of length for measuring interstellar and intergalactic distances, equal to 206,265 times the distance from the earth to the su...

Bosio, François Joseph, Baron

(Encyclopedia)Bosio, François Joseph, Baron fräNswäˈ zhôzĕfˈ bärôNˈ bôsyōˈ [key], 1769–1845, French sculptor. He was employed by Napoleon I to make the bas-reliefs for the column of the Place Vendôm...

Delambre, Jean Baptiste Joseph

(Encyclopedia)Delambre, Jean Baptiste Joseph zhäN bätēstˈ zhôzĕfˈ dəläNˈbrə [key], 1749–1822, French astronomer and mathematician. He was a member of the bureau of longitudes from 1795 and professor at...

Sagarra, Josep Maria de

(Encyclopedia)Sagarra, Josep Maria de (Josep Maria de Sagarra i Castellarnau) zhōsĕpˈ mərēˈə dā səgärˈrə ē kästəl-lyärˈnou [key], 1894–1961, Catalonian poet, novelist, and playwright. He publishe...

Hewitt, Peter Cooper

(Encyclopedia)Hewitt, Peter Cooper hyo͞oˈĭt [key], 1861–1921, American scientist and inventor, b. New York City; son of Abram S. Hewitt and grandson of Peter Cooper. He invented a mercury-vapor lamp and a merc...

Moissan, Henri Ferdinand Frederick

(Encyclopedia)Moissan, Henri Ferdinand Frederick, 1852–1907, French chemist, Ph.D. École Pratique des Haute Études, Paris, 1880. Moissan was a professor at the School of Pharmacy in Paris (1886–1900) and at t...