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Nernst lamp (on), c 1900.

Nernst lamp (on), c 1900.
4 0 c m
actual image size: 23cm x 32cm


Developed by the German physicist Walther Nernst, the Nernst lamp has a rod of refractory metal oxide which conducts electricity when hot and glows brightly when an electric current pases through it. Up to about 1900 a spirit lamp was used to heat the filament initially, but after that a platinum wire wound round a ceramic spiral was used as a heating element. Nernst lamps were more efficient than carbon filament lamps, but were quickly superseded when metal filament lamps became available.

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