History of the United States II / Unit 3 USH2 0303 short lesson, about 20 seconds
Edison at Menlo Park
Captions available
The idea
Thomas Edison built a research laboratory at Menlo Park, where about twenty-five scientists worked on invention as a team.
In practice
Among his other inventions: the storage battery, the dictaphone, the mimeograph, the phonograph and a film projector.
Where people slip
Digital History counts one thousand ninety-three patents in his name. He announced the phonograph in eighteen seventy-seven.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
Builds on
Unlocks
Something wrong in this lesson? Flag it · Sources for History of the United States II