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Saint-Simon, Claude Henri de Rouvroy, comte de

(Encyclopedia)Saint-Simon, Claude Henri de Rouvroy, comte de klōd äNrē də ro͞ovrwäˈ kôNt də săN-sēmôNˈ [key], 1760–1825, French social philosopher; grand nephew of Louis de Rouvroy, duc de Saint-Simo...

propeller

(Encyclopedia)propeller, device consisting of a hub with one or more blades that propels a craft to which it is attached by rotating its blades in a fluid such as air or water. In the latter part of the 1830s the S...

feather star

(Encyclopedia)feather star, common name of a class of echinoderms that, as juveniles, are attached to the sea bottom by a stalk with rootlike branches; the mouth side faces upward. In the adult stage they break awa...

Bronze Age

(Encyclopedia)Bronze Age, period in the development of technology when metals were first used regularly in the manufacture of tools and weapons. Pure copper and bronze, an alloy of copper and tin, were used indiscr...

Miamisburg

(Encyclopedia)Miamisburg mīămˈēzbûrgˌ [key], city (1990 pop. 17,834), Montgomery co., SW Ohio, on the Miami River; laid out 1818, inc. 1932. It is a tobacco market with diverse agriculture, and metal and pape...

Janet, Pierre

(Encyclopedia)Janet, Pierre pyĕr zhänāˈ [key], 1859–1947, French physician and psychologist. As director (1890–98) of the laboratory of pathological psychology at Salpêtrière and as professor of experimen...

Evans, Oliver

(Encyclopedia)Evans, Oliver, 1755–1819, American inventor, b. near Newport, Del. He joined his brothers in a flour-milling business in Wilmington, and after studying similar earlier devices, he developed, install...

thermostat

(Encyclopedia)thermostat, automatic device that regulates temperature in an enclosed area by controlling heating or refrigerating systems. It is commonly connected to one of these systems, turning it on or off in o...

submarine

(Encyclopedia)submarine, naval craft capable of operating for an extended period of time underwater. Submarines are almost always warships, although a few are used for scientific, business, or other purposes (see a...

blazonry

(Encyclopedia)blazonry blāˈzənrē [key], science of describing or depicting armorial bearings. The introduction, since the Middle Ages, of artificial rules and fanciful medieval terms has complicated the science...