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Luce, Henry Robinson

(Encyclopedia)Luce, Henry Robinson, 1898–1967, American publisher, b. Tengchow (now Penglai), China, the son of a Presbyterian missionary. After studying at Yale and Oxford, he worked (1921–22) as a reporter on...

sidereal period

(Encyclopedia)sidereal period, in astronomy, length of time a body takes to complete an orbit relative to the fixed stars. See sidereal time. ...

year

(Encyclopedia)year, time required for the earth to complete one orbit about the sun. The solar or tropical year is measured relative to the sun and is equal to 365 days, 5 hr, 48 min, 46 sec of mean solar time (see...

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...

Aldrich, Nelson Wilmarth

(Encyclopedia)Aldrich, Nelson Wilmarth, 1841–1915, U.S. Senator from Rhode Island, b. Foster, R.I. He rose in local politics as state assemblyman (1875–76) and U.S. Representative (1879–81) before he served a...

Ewing, William Maurice

(Encyclopedia)Ewing, William Maurice, 1906–74, American oceanographer and geologist, b. Lackney, Tex., grad. Rice Institute, now Rice Univ. (B.S., 1926; M.A., 1927; Ph.D., 1931). He taught physics and geology at ...

sawmill

(Encyclopedia)sawmill, installation or facility in which cut logs are sawed into standard-sized boards and timbers. The saws used in such an installation are generally of three types: the circular saw, which consis...

Polykleitos

(Encyclopedia)Polykleitos, Polycletus, or Polyclitus pŏlĭklīˈtəs, –klēˈ–, –klī– [key], two Greek sculptors of the school of Argos. Polykleitos, the elder, fl. c.450–c.420 b.c., was a contemporary...

pound

(Encyclopedia)pound, abbr. lb, unit of either mass or force in the customary system of English units of measurement. Two different pounds of mass are defined, one in the avoirdupois system of units and one in the T...

United States Air Force Academy

(Encyclopedia)United States Air Force Academy, at Colorado Springs, Colo.; for training young men and women to be officers in the U.S. air force; authorized in 1954 by Congress. Temporary quarters were opened at th...