![](https://coimages.sciencemuseumgroup.org.uk/58/890/large_thumbnail_1991_0166.jpg)
Fleming diode
![Original Fleming diode](https://coimages.sciencemuseumgroup.org.uk/453/45/medium_smg00261145.jpg)
Original Fleming diode, filament broken and external connecting loops missing, evacuating pipe broken, (RMW/A1B - McVitie Weston number), by The Edison and Swan Electric Light Company Limited, 1905, invented by Sir (John) Ambrose Feming.