Lee De Forest invented the audion, a vacuum tube device that could take a weak electrical signal and amplify it into a larger one. The audion helped AT&T set up coast-to-coast phone service ...

MODERN invention rivals ancient miracle in its ... a practical and indispensable factor in the world's work. Dr. Lee de Forest, a distinguished electrical engineer and the foremost American ...

Lee de Forest's father was a minister and hoped ... but often was uable to see the potential of his inventions or grasp their theoretical implications. While working on improving wireless ...