One of eighty-six early incandescent lamps. Carbon

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One of eighty-six early incandescent lamps. Carbon filament lamp, two M-shaped filaments, no filament supports. Four platinum lead in wires pass through same quick seal, clear spherical bulb. Top pip. Bayonet cap of insulating material encircled by brass band. Flange on cap near glass. Two elliptical brass contact plates. Robertson etched onglass. 280-8 D.E. etched on glass (volts-c.p.) There are only two electrical contacts the filaments are either inseries or parallel, probably series given the light voltage.


Object Number:
carbon filament lamp
Institution of Electronical Engineering
Permanent collection

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