Re: Light bulb science and technology

[Leigh Palmer <palmer@sfu.ca>]

> Before tungsten can be swaged or extruded it must be saturated
> with copper. After the extrusion and coiling process the copper
> is vaporised from the filament, leaving the tungsten pure once
> again!

Many thanks for that information, Chuck. I never did find out
from Mickey Walsh how it was done. New question: How is Wollaston
wire made? It is Tungsten wire (I think) with a .0001" platinum
core. After fabrication the tungsten is dissolved away with acid
leaving the very thin platinum wire behind.

Leigh