Lee de Forest, American radio pioneer

Lee de Forest, American radio pioneer

H404/0134 Rights Managed

Request low-res file

530 pixels on longest edge, unwatermarked

Request/Download high-res file

Uncompressed file size: 40.3MB

Downloadable file size: 2.6MB

Price image Pricing

Please login to use the price calculator


Credit: SCIENCE PHOTO LIBRARY

Caption: Lee De Forest. Portrait of Lee De Forest (1873- 1961), American radio pioneer, holding the triode valve that he invented. De Forest studied at Yale, gaining his doctorate with a thesis on radio waves. In 1907 he patented the Audion tube, a thermionic triode valve. This was an adaptation of a diode, having a third electrode between the cathode and anode. The triode proved useful in amplifying weak signals and allowed the practical development of radio broadcasting and the first computers. The triodes were eventually replaced by solid-state devices. De Forest also developed a system for film soundtrack recording and a medical diathermy machine.

Release details: Model release not available. Property release not required.

Keywords: audion valve, de forest, engineer, forest, inventor, lee, lee de, pioneer, portraits, radio, surname d, triode, triode valve, valve

Licence fees: A licence fee will be charged for any media (low or high resolution) used in your project.