BGW Edison Effect Lamp 25W 220V
Lampe de démonstration de l'effet Edison
Edison-Effekt-Lampe

BGW = Berliner-Glühlampen-Werk (VEB Narva Kombinat).

Edison's lamps (and all incandescent lamps since) suffered from an problem known as “lamp blackening” in which material evaporated from the filament and deposited on the inner-wall of the glass bulb. The metal plate was intended to catch some of the carbon particles. In 1883, an assistant experimenting with this new device electrically connected the metal plate to the positive and then the negative side of the lamp filament. (Remember, Edison was working with direct current.) To everyone's surprise a current was detected flowing through the vacuum inside the lamp between the filament and the plate.
In 1904, Fleming realized the Edison Effect allowed current to flow only one way (rectification) and used it to detect weak radio signals, creating a diode that became the foundation for electronics and wireless communication, paving the way for modern tubes

 Video on YouTube: Edison Effect

 

Hauteur • Height • Höhe : 10,1 cm • 4"
Diamètre • Diameter • Durchmesser : 6 cm • 2" 3/8

 

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