Oslo 19460126. Light bulb production at the Cooperative National Association's Factory Luma in Oslo …,...

Oslo 19460126. Light bulb production at the Cooperative National Association's Factory Luma in Oslo. The factory is one of the largest in the country and produces approx. 5000 incandescent lamps a day. Here, the thin tungsten thread is "spiralized" around a steel wire and which is later dissolved in hydrochloric acid baths. Photo: Skotaam Aktuell / NTB Oslo 19460126. Light Bulb Production at the Cooperative Factory Called Luma in Oslo. It is one of the biggest factories in Norway, Producing Approx. 5000 lightbulbs per day. This Worker Spins The Wolfram Thread Around A String of Steel, which later Will Dissolve in Hydrocloric Acid. Photo: Skotaam/ Aktuell / NTB