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6 March 2014 1:04 pm ,
Vol. 343 ,
Considered an icon of conservation science, researchers at World Wildlife Fund (WWF) headquarters in Washington, D.C.,...
The new atlas, which shows the distribution of important trace metals and other substances, is the first product of...
Early in April, the first of a fleet of environmental monitoring satellites will lift off from Europe's spaceport in...
Since 2000, U.S. government health research agencies have spent almost $1 billion on an effort to churn out thousands...
Magdalena Koziol, a former postdoc at Yale University, was the victim of scientific sabotage. Now, she is suing the...
Antiretroviral drugs can protect people from becoming infected by HIV. But so-called pre-exposure prophylaxis, or PrEP...
Two studies show that eating a diet low in protein and high in carbohydrates is linked to a longer, healthier life, and...
- 6 March 2014 1:04 pm , Vol. 343 , #6175
- About Us
His Invention Is Still Current
9 July 1999 6:00 pm
Nikola Tesla, a Croatian-American physicist and engineer who pioneered the use of alternating current electricity, was born at the stroke of midnight on this day in 1856. Believing he could improve upon a direct-current electric dynamo, Tesla designed and built the first alternating current induction motor in 1883. It was comprised of an iron rotor spinning between stationary coils electrified by two out-of-phase alternating currents, which produced a rotating magnetic field.
Alternating current could be transmitted over greater distances than direct current, a fact that in 1893 persuaded George Westinghouse to buy Tesla's patents and use the system at Niagara Falls to power the city of Buffalo. Most of today's electric machines run on alternating current. Tesla is also known for the Tesla coil, a transformer he designed to produce high-frequency, high-voltage electricity.
[Source: Roy Porter, Ed., The Biographical Dictionary of Scientists (Oxford University Press, ed. 2, 1994).]