tchannel wrote:
> Hi Folks,  I should start by saying "it has" I just did......I took 
> some ring magnets and slipped them over a length of brass and chrome  
> tv antenna.  North to North, so the top magnet floats above the bottom 
> one.  I then slipped a coil over the top magnet, so its position is 
> South pole just entering the coil.
>  
> The result is somewhat as if the top magnet is hanging from a 
> spring.   There it bobs up and down when the coil and pvc housing are 
> moved or touched.   I tried to measure the frequency and a good guess 
> is 3 to 4 Hz.
I tried that many years ago. I used light emitting diodes. I never got 
it to work. After Chris got me up with Lehmans and magnetic dampening, I 
realized the earth's magnetic field would be an issue and any stray 
fields created by motors, lightning, sunspots etc would require 
shielding. I also had issues of torque between magnets. Let me know how 
you do.
__________________________________________________________

Public Seismic Network Mailing List (PSN-L)