03-04-2006, 08:42 AM
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#2
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Your Bartender
Join Date: Jan 2002
Location: Philly Burbs, PA
Posts: 7,651
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Fascinating but . . .
Quote:
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. . . an acoustic delay line out of 23 feet of lead pipe stuffed with cloth and gauze with a speaker on one side and a microphone on the other. The slower speed of light delayed the signal . . .
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They mean the speed of sound, don't they?
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