What?s Inside a Lightbulb? Twenty Inches of Tungsten Coil

You probably know that an incandescent light bulb uses a tungsten filament.
What’s even cooler is that it’s got 20 inches of double-coiled filament — and tungsten is a brittle mineral that, under normal circumstances, can’t bend at all.
How do they hammer out a brittle metal to a super thin ribbon and then coil it [...]

Source: http://www.wired.com/gadgetlab/2011/03/whats-inside-a-lightbulb/

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