A new failure mode! 75w bulb

You had a Nernst.

NT

or, you have a lot of RF near by

Jamie

I have wanted to try heating up a fragment of ferrite rod as a Nernst lamp but I have no yard to safely test the idea.

Yes, hot glass conducts ionically. I did some work once in a glass fibre factory which had a large (20T IIRC) tank of permanently molten glass feeding the extruders on the floor below. This was heated using oil, gas, or electricity, depending on the cost at the time. The electric heating just comprised electrodes fed from a suitable transformer.

Cheers

is glowing dull orange.

HUT OFF! OK, so maybe the switch is fried.

hand.

. It's hot, but not unusually so. It does operate base-upwards in the la mp.

t is fine, unbroken. But the glass support for the iron wires has a large hole melted in the side.

liquid glass as it's light-generator? Rats, I should have plugged it back in to see how long it could continue that way.

r.

Another mystery is why Skybuck's lamp glowed orange hours earlier. When he sees this thread he'll think Prince made it happen from the other side.

So do you. Use an aluminum hat.

No but I make them for those like you.

Molten glass has a negative resistance tempco. Hence the original Nernst lamps had series resistors.

NT

Just for interest's sake, how did the electrode-only heating method start up? Heated by some other means?

RL

Yes, the glass was permanently molten 24/7 and the factory worked around the clock. IIRC it shut down once a year in the summer for a furnace rebuild. Of course, to restart would require 'conventional' heating.

This bulk electric heating was only used when it was cheaper, so I guess at night.

The final, finely controlled heating stage was as the glass fibre was pulled through overhead finely perforated Platinum plates (called 'bushings' IIRC) which used ohmic heating.

Cheers

I'm confused. The bulb filament *must* be broken, else it wouldn't shut do wn. Maybe theres a fracture in the iron filament-support wire. It might d issolve in liquid glass, causing the hot zone to spread. Like putting a 2

Yes, 2012, inspired by my original 2007 video, Melt a Frickn' Beer Bottle

Here's a version which isn't blocked by youtube as "adults only."

Would it liquify?

People have used pieces of white ceramic knives for this. Or, get it from a "knife sharpener" which uses two crossed 1/8" ceramic rods.

Last I was there, Harbor Freight Tool sells both.

The filaments in fluorescent lamps glow orange when the starter doesn't sta rt up the lamp. Spontaneous orange-glowing edison bulbs are far more weir d.

But mine happened awhile ago ...JUST BEFORE THE CHILEAN EARTHQUAKE, AHA! So Skybuck's probably was a warning for that, not for Prince. We all know that the spirits get confused about things like "past" and "future," and fr equently predict things which have already occurred.