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to appreciate just how amazing the tungsten light bulb filament is, I....I second this. In the 4th Ed of Cutnell & Johnson, students calculate
urge every physics teacher to make the small effort required to look
closely at the filament from a 60W or 100W light bulb. Break a burned
out bulb to get at it; you can't see it though the envelope without a
good long distance microscope. A good hand magnifier will serve to
reveal the structure, but a stereo microscope is better if you have
Leigh