Thomas Edison demonstrates incandescent light | December 31, 1879 | 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.