NavList:

"Keys, belt buckles and knives are more of a risk than most modern watches"

I take this back. Modern watches have a marked effect on a compass needle, over 15 degrees deviation either way. Presumably the stepper motor that drives the hands has a permanent magnet in it.

"metal spectacle frames are unlikely to be a hazard, as most are not made of iron, steel or nickel, and the mass of steel in the two screws that hold the "temporals" to the front is unlikely to have an observable effect."

Still a null effect aftr more testing with a total of five pairs of specs., so if an effect is observed, I assume the spectacles are made of steel.

Can some physicist or power engineer explain how an alternating current can produce a constant magnetic field? Could corona discharge really account for the observation or must we postulate rusty joints in transmission towers acting as rectifiers?

Bill Morris
Pukenui
New Zwaland.
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