Titel
Nernst lamp, German, c 1900.
Caption
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 passes 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 Nernst lamps were more efficient than carbon filament lamps, but were quickly superseded when metal filament lamps became available., 6976048
Aufnahmedatum
01.01.2009
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Science & Society / FOTOFINDER.COM
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10276182
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2525px x 3504px, 21,40 cm x 29,70 cm (300 dpi)
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Land
Germany
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6976048
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