One of eighty-six early incandescent lamps. Carbon

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One of eighty-six early incandescent lamps. Carbon filament lamp, single loop filament, no filament supports. Filament cemented into drilled carbon cylinders filted over platinum lead inwires passing into two glass stems containing mercury and filled with plaster. Bulb ellipsoidal, opal glass, joined to clear glass just above long neck; lamp has snapped at neck, but been glued back into position; no vacuum. Sealing pip at side of neck. Base: copper wires lead out of plaster ( 1 now broken) through fibre washer at bottom of loose fitting brass cylinder one wire originally soldered to cylinder, one central metal pin. Lane-Fox. No ratings specified.


Object Number:
carbon filament lamp
Institution of Electronical Engineering

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