The Ebay Item Number is 200334607108
----- Original Message ----- 
From: "Kareem Lanier" 
To: 
Sent: Wednesday, April 22, 2009 8:10 PM
Subject: RE: TELEDYNE GEOTECH HELICORDERS


> Whats the ebay part number?
>
> -----Original Message-----
> From: psn-l-request@.............. [mailto:psn-l-request@............... 
> On
> Behalf Of James Allen
> Sent: Wednesday, April 22, 2009 7:54 PM
> To: psn-l@..............
> Subject: Re: TELEDYNE GEOTECH HELICORDERS
>
> There is a large lot of Teledyne Geotech Helicorders just listed on Ebay
> today.  Problem is, it is a very large "lot auction"  that would entail
> shipping cost for hundreds of pounds of equipment.
> James Allen
>
> ----- Original Message ----- 
> From: ChrisAtUpw@.......
> To: psn-l@..............
> Sent: Thursday, October 02, 2008 4:33 PM
> Subject: Re: Torsion Seismometer
>
> In a message dated 2008/10/02, tchannel1@............ writes:
>
>
>
> I have seen something similar somewhere on the web, but I
> can't find it.   This is all I could find.   If someone has tried this
> please email me.   Thanks, Ted
> Torsion Seismometer Wood Anderson
> http://www.data.scec.org/Module/s3inset3.html
>
>
>
> Hi Ted,
>
>        The Wood-Anderson was a horizontal system with a torsion
> suspension, magnetic damping, optical + photographic recording and a 
> period
> of about a second. There is no reason why you could not fit a dual Si
> photocell readout system.
>
>        To increase the period you can reduce the wire diameter /
> increase the wire length / mount the mass on an extended side boom to
> increase the inertia.
>
>        Check out
>        http://doga.ogs.trieste.it/doga/risk/woodanderson/index.html
>        http://www.eas.slu.edu/Earthquake_Center/Instruments/
>
>        Randall Peters has a vertical torsion device on this website.
>        http://physics.mercer.edu/hpage/peters.html
>
>        Regards,
>
>        Chris Chapman
>
>
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