Philadelphia hosted the 1876 Centennial Exhibition where Thomas Edison displayed telegraph equipment.
The Centennial Exhibition was held in Philadelphia to celebrate the 100th anniversary of the United States Declaration of Independence. Edison attended the international exposition and displayed telegraph-related equipment, helping visitors and other inventors see the practical possibilities of electrical communication.
The exhibition was one of the major technology showcases of the nineteenth century. It brought together inventions, machines, industrial products, and cultural displays from the United States and many other countries. Alexander Graham Bell demonstrated his telephone there, while other exhibits presented advances in manufacturing and engineering.
Philadelphia is sometimes confused with Menlo Park in questions about Edison’s early public demonstrations. Menlo Park was his New Jersey research center, whereas Philadelphia was the host city for the 1876 international exhibition. Edison was still several years away from his best-known incandescent-lamp demonstrations.