Original antique incandescent light bulb with a carbon filament, probably m=
=3Dade in England just after the turn of the century. This vintage light bu=
lb =3Dhas an circular 3 coil supported filament. Etched on the glass is Rob=
ertson=3D 100 - 32 - L - 5. It has a UK standard brass bayonet cap fitting=
. Shown g=3Dlowing at around 50 volts for the photograph.