One of eighty-six early incandescent lamps. Carbon

One of eighty-six early incandescent lamps. Carbon filament lamp, 1 arch filament stick. Cemented into longitudically drilled carbon cylinders filled over lead-in wires which pass through twin stems containing mercury and sealed with plaster.Clear bulb. Pip at side of neck. Loosely attached brass cap with fibre (?) insulation between outside and central contact to which wires are connected. Lane-Fox 1882?. Paper label stuck to neck says: M. 7UC, N. 3721, R. C34HI, EMF. 54 (?), S. 16,7, N.C.P. 20.


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carbon filament lamp
Institution of Electronical Engineering
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