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Sounds like dodgy pseudo-science at it's glorious best.
But, if I put on my "not-a-totally-sceptical-git" hat on for a second, I'd be willing to theorise that if you bombard a stone with ultrasound, then it might be possible that the sound waves could vibrate any quartz in the stone to release the odd electron or two, in a vaguely piezo-electric manner. These electrons might then generate field which might then be detectable by a magnetometer.
If the stone had enough quartz. If the ultrasound was capable of vibrating the quartz. If enough electrons were released to generate an e.m. field. If the field is strong enough to be detected. And perhaps more importantly, if you really, really wanted to find an energy surge.

I'm quite aware that this is highly dubious reasoning, and would like to declare that I know very little about physics anyway. The conjecture is partly for fun, partly as an exercise in trying to stay fairly open minded.

Not bad for a non-physicist. I'll bet that there is even a real physicist out there somewhere who might argue along similar lines, but as you rightly point out, the effect is likely to be so infinitessimaly small as to undetectable. Also, it's likely that the quartz crystals would be randomly orientated and as such their piezo voltages would cancel each other out rather than accumulating any field strength.

P.S. Yes, I'm a physicist.

Hi Hob,

I remember reading a book by Tom Greave called "Needles of Stone" that covered topics such as this.

There is now an on line version at :-

http://www.isleofavalon.co.uk/GlastonburyArchive/ndlstone/00contnt.html

Hope you find it usuful !

RIV

Coming back to the beginning....

I'd agree with you here, any object has resonance and bombarding a crystal structure with ultrasound may well produce electricity that is detectable.

However, it is man who is doing the bombarding, so this is an artificially created thing that would be detected, not a naturally occuring phenomena.

The start of this thread is really about circles being a focus for power in the first place, without manmade external input and specifically about this power fluctuating at set times during the day.

The ultrasound experiments must be an attempt to measure this by using ultrasound to amplify the effect to make it detectable, which I find a questionmable approach (not that I know anything about it), since the origin of this supposed power is not understood, the right way of amplifying it is not understood either.

There may well be a change in the overall hatmonic resonance of rock due to cooling at night for example, and this may be detectable using ultrasound. But what does that prove?