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                                               Today@VOA
                                            No.597(1.1. 2018)
"
On December 31, 1879, inventor Thomas Alva Edison demonstrates his incandescent light bulb..."
                  "1879 Edison demonstrates incandescent light-HISTORY
          "Thomas Alva Edison-Wikipedia"       "Thomas Alva Edison-photos
       "Incandescent light bulb-Wikipedia"   "List of Edison patents-Wikipedia"
      "
Thomas Edison words-pictures"     (The 87-photo-attached file/353.72KB)

On This Day in American History
On December 31, 1879, inventor Thomas Alva Edison demonstrates his incandescent light bulb by lighting a street in Menlo Park, New Jersey. While the incandescent bulb had been invented some 40 years earlier, Edison’s was the first practical design that could burn steadily and relatively efficiently. Anticipation for Edison’s demonstration was so high that the Pennsylvania Railroad company ran special trains to Menlo Park to accommodate public interest in the event.

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                "1879 Edison demonstrates incandescent light-HISTORY"
In the first public demonstration of his incandescent lightbulb, American inventor Thomas Alva Edison lights up a street in Menlo Park, New Jersey. The Pennsylvania Railroad Company ran special trains to Menlo Park on the day of the demonstration in response to public enthusiasm over the event.

Although the first incandescent lamp had been produced 40 years earlier, no inventor had been able to come up with a practical design until Edison embraced the challenge in the late 1870s. After countless tests, he developed a high-resistance carbon-thread filament that burned steadily for hours and an electric generator sophisticated enough to power a large lighting system.

Born in Milan, Ohio, in 1847, Edison received little formal schooling, which was customary for most Americans at the time. He developed serious hearing problems at an early age, and this disability provided the motivation for many of his inventions. At age 16, he found work as a telegraph operator and soon was devoting much of his energy and natural ingenuity toward improving the telegraph system itself. By 1869, he was pursuing invention full-time and in 1876 moved into a laboratory and machine shop in Menlo Park, New Jersey.

Edison’s experiments were guided by his remarkable intuition, but he also took care to employ assistants who provided the mathematical and technical expertise he lacked. At Menlo Park, Edison continued his work on the telegraph, and in 1877 he stumbled on one of his great inventions–the phonograph–while working on a way to record telephone communication. Public demonstrations of the phonograph made the Yankee inventor world famous, and he was dubbed the “Wizard of Menlo Park.”