From: Pete Rowe 
To: psnlist 
Sent: Tue, 2 Apr 2013 16:59
Subject: Re: Gas monitoring hardware and gravity monitoring

Greeting from California, Jon
I have many 8 Hz L10B geophones. I know they aren't as useful as 4.5 Hz=20
units, but
mine are free to you if you pay the postage. I will send you 10 of them=20
if you want.
I hope you keep all of us posted on your plans to move to the Azores.

73,
Pete

Hi J=C3=B3n,
     If you could make / use a x10 Roberts period extension circuit, you=20
could get a 0.8 Hz
response and see both P and S waves reasonably clearly.
    Regards,
    Chris Chapman

 From: J=C3=B3n Fr=C3=ADmann jonfr@.........
  Subject: Gas monitoring hardware and gravity monitoring
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