(Encyclopedia) English units of measurement, principal system of weights and measures used in a few nations, the only major industrial one being the United States. It actually consists of two related…
U.S. Department of State Background Note Index: Historical and Cultural Highlights Government and Political Conditions Defense and Military Issues Foreign Relations U.S. Policy Toward North…
(Encyclopedia)
CE5
Internal-combustion engines: In the four-stroke reciprocating engine (above), a mixture of fuel and air is taken into the chamber on the down-stroke of the piston, is compressed…
(Encyclopedia)
CE5
Electrical and radio symbols
electricity, class of phenomena arising from the existence of charge. The basic unit of charge is that on the proton or electron—the proton's…
(Encyclopedia) locomotive, vehicle used to pull a train of unpowered railroad cars.
Richard Trevithick, a British engineer and inventor, built and operated (1803–4) the first successful steam…
(Encyclopedia) glass, hard substance, usually brittle and transparent, composed chiefly of silicates and an alkali fused at high temperature.
Glass has become invaluable in modern architecture,…
(Encyclopedia) horror or horror story, literary genre in which an eerie, tense, often suspenseful atmosphere typically builds to the discovery of something repugnant, such as cannibalism, incest, or…
(Encyclopedia) Franklin, Benjamin, 1706–90, American statesman, printer, scientist, and writer, b. Boston. The only American of the colonial period to earn a European reputation as a natural…
