At 10:31 AM 2/12/2011, you wrote:
>We had a lecturer at college whose party trick ...
>
>"I always switched on the stereo", he said. "Try it next time
>you're there and listen - it hums a
>perfect concert A"
Something,s not right here.
If in England where the power is 50 Hz, the hum harmonics would be
100 Hz, 200 Hz, 400 Hz.
That's not very close to 440.
If in the US with 60 Hz power, the hum harmonics would be 120, 240, 480
Still not very close to 440.
Not what I'd call a "perfect" concert A.
What' up with that?
Or
Are they close enough that nobody can tell the difference?
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John Burch
West suburban Chicago
o|||||||o
The surest sign that intelligent life exists in the universe
is that it has never tried to contact us.
Calvin of Calvin & Hobbes
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