One of eighty-six early incandescent lamps. Carbo
One of eighty-six early incandescent lamps. Carbon filament lamp, 1 parchmentised thread, thickened seals, wedge joint to lead-in wires, badly broken. Lead in wires in glass H patters inner stem. Clear bulb with focused on long stem, uncapped. Top pip. Swan 1881. Paper label mark 509.3 ohms
- Object Number:
- carbon filament lamp
- Institution of Electronical Engineering
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