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, one filament support, extending vertically from base. Lead in wires, single piece platinum: quite long. Pass through glass bead which also carries the support. Long pear shaped bulb; with shoulder at base. Top pip. Bayonet cap, with pronounced shoulder. Attached by plaster-dumples in glass bulb. Insulating material is black. Elliptical brass contact packs with holes through which lead in wire soldered.Manufacturer unspecified. 8 150 marked on base (c.p. volts).


Object Number:
carbon filament lamp
Institution of Electronical Engineering

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