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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 ...

jet propulsion

(Encyclopedia)CE5 Types of jet engines: In the propeller-driven turbine a stream of high-velocity gases provides the power to drive the turbine and turn the propeller. In the jet-driven turbine the stream of gas...

Brittany

(Encyclopedia)Brittany brĭtˈənē [key], Breton Breiz, Fr. Bretagne, region and former province, NW France. It is a peninsula between the English Channel (N) and the Bay of Biscay (S) and comprises four departmen...

plastic

(Encyclopedia)plastic, any organic material with the ability to flow into a desired shape when heat and pressure are applied to it and to retain the shape when they are withdrawn. The first important plastic, cel...

lead, chemical element

(Encyclopedia)lead, metallic chemical element; symbol Pb [Lat. plumbum]; at. no. 82; at. wt. 207.2; m.p. 327.502℃; b.p. about 1,740℃; sp. gr. 11.35 at 20℃; valence +2 or +4. One of the oldest metals used by h...

Buenos Aires

(Encyclopedia)Buenos Aires bwāˈnəs īˈrēz, ârˈēz, Span. bwāˈnōs īˈrās ...

locomotive

(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 engine locomotive f...

Ohio, state, United States

(Encyclopedia)CE5 Ohio, midwestern state in the Great Lakes region of the United States. It is bordered by Pennsylvania (NE), West Virginia (SE) and Kentucky (S) across the Ohio River, Indiana (W), and Michigan ...

battery, electric

(Encyclopedia)CE5 Lead storage cell: At the lead-dioxide electrode, electrons from the circuit combine with lead dioxide and sulfuric acid to form lead sulfate and water. At the spongy-lead electrode, lead react...

small arms

(Encyclopedia)small arms, firearms designed primarily to be carried and fired by one person and, generally, held in the hands, as distinguished from heavy arms, or artillery. Automatic small arms were develope...