One of eighty-six early incandescent lamps. "Twis
One of eighty-six early incandescent lamps. "Twisted arch" filament. Bulky cement joint to lead in, wires in pinched internal stem filled with plaster of paris. Clear bulb, top pip, no cap, wires broken at surface of plaster of paris pronounced "belly" in stem. 40 on stuck-on paper label. Candlepower?
- Object Number:
- carbon filament lamp
- Institution of Electronical Engineering
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