The Nernst Lamp
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Uploaded by EdisonTechCenter on Oct 17, 2011
Nernst Lamp (Nernst Glower) was developed in 1897 as a more efficient replacement for Edison's incandescent lamp. Lighting collector Rick DeLair takes you through all the parts of the Nernst Lamp. See schematics, heater tubes, glower, shifter, ballast. First sold by AEG 1900, and Westinghouse in 1901. It was the best lamp until 1913 when ductile tungsten replaced it. Invented by Walther Nernst. See diagram and graphics to help explain how it works.
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"German silver" heater? absolutely not. Silver would stand no chance in a nernst lamp.
The heater was made of tungsten and was turned off to stop it drawing current and fusing at the temperature these lamps operate.
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The normally-open contact, when closed, (according to the diagram) shorts out the shifter, why wouldn't the shifter then shift back to the start position? There would need to be some method by which the shifter is kept in the run position. If the shifter was thermal, the resistance of the bi-metallic strip could be designed to produce enough heat to keep it in the run position.
Why did tungsten lamps replace the Nernst? Cost?
CampKohler 4 months ago
@CampKohler Carbon and bamboo filaments were the norm in 1900, German and US companies were desperately seeking to end GE's domination in the light market by hoping to make the jump in quality to metallic filaments. Tantalum, sintered tungsten, GEM lamps were on route to the final ductile tungsten (sold in 1913). Nernst was an interesting derivative of the market struggle of the time period. Tungsten was cheaper to make and more reliable than Nernst.
EdisonTechCenter 4 months ago
@EdisonTechCenter Cheaper I can understand. But what was the reliabilty due to exactly, elimination of the shifter with its moving parts and contacts or something to do with the glower?
CampKohler 4 months ago
@CampKohler Looking at all the parts it looks like reliability became an issue, but I'd hope a collector who is knowledgeable in the rare Nernst lamp type will find this video and be able to answer with some more information. this is the most obscure of our lamp types listed on our page. There will be 10 more videos coming out on other kinds of lamps soon.
EdisonTechCenter 3 months ago