One of eighty-six early incandescent lamps. Two single loop filaments

Made:
1881

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One of eighty-six early incandescent lamps. Two single loop filaments, one longer than the other. One support for each filament, attached to side of bulb. Each filament attached to platinium passing through seperate pinch seals. Pear shaped bulb, clear, with shoulder to base. Top P.P. Bayonet type cap, with shoulder, but with unusual bottom contacts, and with horizontally projecting pin and knob from base. Base attached with plaster but insulation at bottom is fibre, and there are three segmental contacts, with a gap for the rest of the circle. (? Is this a switch - use the knob to turn the lamp between off/dim/bright). Ediswan - etched (faintly) on glass. 100 - 8, 100 - 16 etched faintly on glass (volts-c.p.). Also, '32' etched on glass nearone filament support, in script.

Details

Category:
Lighting
Object Number:
1923-173/73
type:
carbon filament lamp
credit:
Institution of Electronical Engineering