One of eighty-six early incandescent lamps. Carbon

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One of eighty-six early incandescent lamps. Carbon filament lamp, M-shaped cylindrical thikish filament. Filament attached by paste to plpatinum tubes crumped over lead in wires in split internal stem, apparently attached to copper wires at other side of glass. Clear cylindrical bulb. No visible pip. Attached to cylindrical metal base by plaster, with wooden plug (now loose) carrying two contact posts and with female screw thread. No markings. Some similar feature to 1923-173/85.


Object Number:
carbon filament lamp
Institution of Electronical Engineering

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