Lead: In 1877, Thomas Alva Edison stumbled upon his most original invention, the audio phonograph. He captured sound.
Intro.: A Moment in Time with Dan Roberts.
Content: Most of Thomas Edison's inventions were either improvements on other ideas or adaptations of existing technology. His incandescent lamp was vastly more efficient than any before, making home lighting economically viable. His kinetoscope laid the foundation for the modern motion picture. It was with the phonograph, however, that Edison made his most creative contribution to modern life and its discovery was by accident.