Re: The lightbulb conspiracy
I always thought the coiled coil bulb filaments were developed as a way to reduce heat-losses from the filament so it ran hotter and hence gave a "whiter" light.
(Some of the early lightbulbs had a really noticeable yellow tinge to their light)
Hmmm... the filaments of indirectly-heated valves are generally made using a tightly-coiled wire element a length of which is folded back on itself a few times before being fitted into the cathode-tube. I guess that's the only way to get a long-enough piece of filament (high enough resistance) in there.
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