Example image of eyePlorer eyePlorer map for 'Lee De Forest': Invention United States Audion tube Electricity Vacuum tube Electronics American Institute of Electrical Engineers Institute of Electrical and Electronics Engineers Institute of Radio Engineers Council Bluffs, Iowa Congregational church African American Talladega College Talladega, Alabama Connecticut Northfield Mount Hermon School Sheffield Scientific School Yale University Bachelor's degree Doctor of Philosophy Illinois Institute of Technology Detector (radio) Diode Fleming valve Triode Anode Cathode Control grid Electrode Incandescent light bulb Plate Amplifier Computer Digital Guglielmo Marconi Nikola Tesla Radar Radio Telephone Transistor Irving Langmuir SS Haimun Steamboat The Times Broadcasting Steam yacht Communication Lake Erie South Bass Island Wireless