SAT写作素材——发明创造_SAT写作

SAT写作素材——发明创造

　　1876:Telephone

　　Not realizing the full impact it would have on society, Alexander Graham Bell introduced the first telephone to an amazed audience at Americas Centennial Exposition in Philadelphia in 1876. Within a year, Bell had installed 230 phones and established the Bell Telephone Company, which was later transformed into ATT. In 1997, 643,000,000,000 calls were made by people in the United States alone.

　　1901:Wireless transmission of a signal

　　On December 12, 1901, Guglielmo Marconi transmitted the Morse code letter s across the Atlantic from Cornwall, England, to St. Johns, Newfoundland. This demonstration of wireless transmission eventually paved the way for todays complex global communications, including radio, radar, and even signals from other planets.

　　1926:First public demonstration of television

　　On January 26, 1926, John Logie Baird displayed television for the first time in public at a department store in London. This was the first major step in the advancement of television since Paul Nipkow received a patent on his proposal for a mechanical television system in 1883. By 1993, there were 215 million television sets in the United States alone.

　　1947:Silicon chip

　　After ENIAC, the first computer, was invented in 1946, researchers sought a more practical way to perform highly complex calculations. In 1947, three engineers demonstrated that it was possible to selectively control the flow of electricity through silicon. This discovery led to the creation of microprocessors and has since paved the way for todays high-speed, efficient computers.