Wouldn't the tungsten evaporate evenly over the entire filament (except perhaps wherever the support wires touch and cool the filament)? Then, instead of a clean break in an almost-new-appearing fillament as shown, the filament would gradually thin, until one day it becomes so fragile that it breaks from the thermal shock of starting up.
Does the distance from the filament to the glass (say in a bigger envelope) make a difference in the blackening rate or whether it will at all?
This is a super simplified model to show the act of blackening, another model could be done to show why it breaks at certain points over others.
EdisonExploratorium 2 months ago
Wouldn't the tungsten evaporate evenly over the entire filament (except perhaps wherever the support wires touch and cool the filament)? Then, instead of a clean break in an almost-new-appearing fillament as shown, the filament would gradually thin, until one day it becomes so fragile that it breaks from the thermal shock of starting up.
Does the distance from the filament to the glass (say in a bigger envelope) make a difference in the blackening rate or whether it will at all?
CampKohler 3 months ago