Columbia Encyclopedia

(Encyclopedia) ergonomics, the engineering science concerned with the physical and psychological relationship between machines and the people who use them. The ergonomicist takes an empirical approach to the study o...

(Encyclopedia) German shepherd, breed of large, muscular working dog perfected in Germany at the turn of the 20th cent. It stands about 25 in. (64 cm) high at the shoulder and weighs from 60 to 85 lb (27.2–38.5 kg...

(Encyclopedia) French bulldog, breed of small, alert nonsporting dog with batlike ears, developed in France in the second half of the 19th cent. It stands about 12 in. (30.4 cm) high at the shoulder and weighs from ...

(Encyclopedia) mercury poisoning, tissue damage resulting from exposure to more than trace amounts of the element mercury or its compounds. Elemental mercury (the silver liquid familiar from thermometers) is the mos...

(Encyclopedia) chalcedony kălsĕdˈənē [key] [from Chalcedon], form of quartz the crystals of which are so minute that its crystalline structure cannot be seen except with the aid of a microscope. Chalcedony has ...

(Encyclopedia) Limousin or Limosin, Léonard lāônärˈ lēmo͞ozăNˈ, lēmôzăNˈ [key], c.1505–c.1577, French painter in enamel, most celebrated member of a family of Limoges enamel artists. His earliest auth...

(Encyclopedia) leaf insect, common name given to herbivorous insects of leaflike appearance forming a single family in the order Phasmida. Leaf insects are green and have extremely flattened, irregularly shaped bodi...

(Encyclopedia) Australian terrier, breed of small, hardy terrier perfected in Australia c.1885. It stands about 10 in. (25.4 cm) high at the shoulder and weighs from 12 to 14 lb (5.5–6.4 kg). Its weather-resistant...

(Encyclopedia) Marden, Brice, 1938–, American painter, b. Bronxville, N.Y.; grad Boston Univ. (B.F.A., 1961), Yale Univ. (M.A., 1963). Marden began exhibiting his work in the 1960s, becoming known for minimalist a...

(Encyclopedia) Marin, John mărˈĭn [key], 1870–1953, American landscape painter, b. Rutherford, N.J. After a year at Stevens Institute of Technology, he worked for four years as an architectural draftsman. At 28...