Fleming's thermionic valve
This valve was used by J. Ambrose Fleming in his early experiments leading to the development of the thermionic valve.
This valve may look like a Martian tripod but it is in fact one of the fourteen valves used by J. Ambrose Fleming in his early experiments in 1889-90.
Fleming was UCL’s first professor of Electrical Engineering, holding the post from 1885-1926. During this time he also worked closely with Guglielmo Marconi as a scientific consultant researching long-distance radio transmission.
![Bulb](https://www.ucl.ac.uk/culture/sites/culture/files/styles/medium_image/public/ee-088.jpg?itok=zfgkksdJ)