Dictionary of Energy

Stephenson, George sublimation

Stephenson, George

1781 1848, English engineer who developed the first successful steam locomotive (1815). He made important advances in railway design, including the use of tunnels and embankments, and malleable iron rails instead of cast iron. He also devised a miner s safety lamp at about the same time as did Sir Humphry DAVY.

step-up

Electricity. 1. to change electricity from a lower to a higher voltage. 2. such an increase in voltage. 3. describing a transformer that has more turns of wire in the secondary winding than in the primary, which causes an increase of the voltage.

steradian

Measurement. a unit of solid angular measurement; a solid angle that, having its vertex at the centre of a sphere, cuts off an area of the surface of the sphere equal to that of a square with sides of length equal to the radius of the sphere.

Stevens, John

1749 1838, U.S. mechanical engineer who was a pioneer in steamboats, including the world s first sea-going steamboat and steam ferry service. He also was among the first to demonstrate the feasibility of steam locomotion on a rail track (1826).

Stevin, Simon

1548 1620, Flemish scientist who introduced decimal fractions to Europe and also made important early contributions to energy mechanics, describing the theory of levers, the inclined plane, and pulleys.

Stewart, Alice

1906 2002, British physician who was the first to...

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