Werderman electric lamp. Engraving of Werderman electric lamps illuminating the Paris Opera foyer,France,in 1881. These lamps were carbon arc lamps consisting of a pair of carbon rods. Through these rods a massive voltage was applied. The high voltage caused sparks to arc across the two rods. It also caused the carbon to vaporize,this caused a continuous glow. Werderman lamps used weights to maintain a constant gap in the carbon arc | |
Licence : | Droits gérés |
Crédit: | Science Photo Library |
Taille de l’image : | 4160 px × 4606 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |