All this talk about magnetically induced wobble makes me remember
the time that I lived in a third floor apartment; the 13.2KV
distribution lines feeding a nearby refrigerator/stove factory were
about 10ft away from my window (and my monitor). I could tell
very easily when the porcellanization electric furnace at
the factory was turned on or off. I was able to measure
fields in excess of 300 milligauss at the window, though
they practically dissapeared by the bedroom.
Those 13.2KV lines were good earthquake detectors as well.
I remember seeing them dancing around before I could feel
the actual vibration, which eventually grew into a
deadly 7.2 quake that killed a couple hundred in a nearby
city.
I prefer single-level houses now.
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Carlos E. Murillo-Sanchez carlos_murillo(a)nospammers.ieee.org