Hi

Here are pictures of the top and lower pivots. The top is a hindge that
allows free movement of the arm.

It was recomenned to me that I should put the magnet on the base, not
the arm. But I am not sure about the diffrance, I don't think it is
none. But it works anyway.

I am still unable to get the sensor frequancy below 0.4Hz. But this
design is a lot more flexable then the last one I used.

After the weekend I am going to do one more change. I plan to change the
setting of the arm. So it has not such sharp angle, but I belive that is
hampering my effort in getting the frequancy below 0.4Hz, as sharp angle
means faster movement of the arm.

http://www.jonfr.com/myndir/v/geology/lehman/p5010001.jpg.html
http://www.jonfr.com/myndir/v/geology/lehman/p5010002.jpg.html
http://www.jonfr.com/myndir/v/geology/lehman/p5010003.jpg.html

Regards.
J=F3n Fr=EDmann.



On fim, 2009-04-30 at 19:46 -0700, Robert O. Green wrote:
> Jon,
>=20
> Very nice.
>=20
> Can you describe the upper and lower pivots?
>=20
> Is there advantage to having the coil on the boom rather than the magnet?
>=20
> Rob
>=20
> J=F3n Fr=EDmann wrote:
> > Hi all
> >
> > I got a new lehman seismomter build from the old one, that was not
> > working. The new one is bit more complex and more adjustable. Now I jus=
t
> > have to figure out how to get the seconds down to 10 to 20 seconds.
> >
> > Here are pictures.
> >
> > http://www.jonfr.com/myndir/v/geology/lehman/p4300001.jpg.html
> > http://www.jonfr.com/myndir/v/geology/lehman/p4300002.jpg.html
> >
> > Regards.
> >  =20
> > -----------------------------------------------------------------------=
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> >
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009 5:25 PM
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> >  =20
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--=20
J=F3n Fr=EDmann

http://www.jonfr.com

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