Talk:Iron–hydrogen resistor

Use/Origin
This Iron-Hydrogen resistors were used as ballasts for Nernst Lamps.(around 1900) Whether they were developed in that context, or had been there before, I don't know. —Preceding unsigned comment added by 93.221.245.78 (talk) 09:52, 18 September 2010 (UTC)

Funktion
The funktion given in the article is wrong. The resistance does not increase by a increase of temperature of the filament. Iron in Hydrogen changes its resistance just below dull red glow about ten- or hundredfold at a certain temperature. When you watch the filament at increasing voltage (abslutely dark room!) you will see that first a small length of the filamnt begins to glow, and with further voltage increase this glowing length increases, but its temperature remains almost constant. This two-phase phenomenon is rather difficult to understand quantitatively, that is reason why traditionally wrong explanations roam literature. —Preceding unsigned comment added by 93.221.245.78 (talk) 10:01, 18 September 2010 (UTC)