Columbia Encyclopedia

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tractor

(Encyclopedia)tractor, in agriculture, vehicle used to pull such equipment as plows, cultivators, and mowers; to power stationary devices such as saws and winches; and to push snowplows and earth-moving implements....

watch

(Encyclopedia)watch, small, portable timepiece usually designed to be worn on the person. Other kinds of timepieces are generally referred to as clocks. At one time it was generally believed that the first watches ...

Feringa, Bernard Lucas

(Encyclopedia)Feringa, Bernard Lucas, 1951–, Dutch organic chemist, Ph.D. Univ. of Groningen, Netherlands, 1978. He has been on the faculty at the Univ. of Groningen since 1984. Feringa was jointly awarded the 20...

Falkirk

(Encyclopedia)Falkirk fŏlˈkûrk [key], town, Falkirk council area, central Scotland, on the Forth and Cly...

Iacocca, Lee

(Encyclopedia)Iacocca, Lee (Lido Anthony Iacocca) īˌəkōˈkə [key], 1924–2019, American automobile business executive, b. Allentown, Pa., grad. Lehigh Univ. (1945), Princeton (M.A., 1946). That year he joined...

McCormick, Cyrus Hall

(Encyclopedia)McCormick, Cyrus Hall, 1809–84, inventor of the reaper, b. Rockbridge co., Va. His father, Robert McCormick (1780–1846), had worked intermittently for over 20 years at his blacksmith shop on a rea...

machine

(Encyclopedia)machine, arrangement of moving and stationary mechanical parts used to perform some useful work or to provide transportation. From a historical perspective, many of the first machines were the result ...

gem, ornamental mineral or organic substance

(Encyclopedia)gem, commonly, a mineral or organic substance, cut and polished and used as an ornament. Gems also are used as seals (items of assurance) and as talismans (good-luck charms). For birthstones, see mont...

Duncan, Isadora

(Encyclopedia)Duncan, Isadora ĭzˌədôrˈə dŭngˈkən [key], 1878–1927, American dancer, b. San Francisco. She had little success in the United States when she first created dances based on Greek classical ar...

Murray, Les

(Encyclopedia)Murray, Les (Leslie Allan Murray), 1938–2019, Australia's leading poet of the late 20th and early 21st cent., B.A. Univ. of Sydney, 1969. Son of an impoverished dairy farmer, he grew up in New South...