Does an incandescent lightbulb continue to use electricity after it's burnt out? [more inside]
posted by muddylemon on Feb 10, 2007 - 13 answers

Was Edison's original light bulb really designed to never run out? [more inside]
posted by sjvilla79 on Oct 29, 2005 - 14 answers

Today, at an antique mall, I found, for $2 each, three Edison discs (also known as "Edison diamond discs"), big, thick (1/4"), 78-size records. I'm quite sure they're not valuable or anything, but I'd like to know more about them: when they were made, what the serial numbers etched into them refer to, who the artists were, etc. Does anyone know how to learn more about these things, either online or in print? [more inside]
posted by Dr. Wu on Mar 20, 2005 - 12 answers