PSN-L Email List Message

Subject: Re: Tiltmeter designs
From: George Bush ke6pxp@.......
Date: Thu, 05 Apr 2007 09:57:01 -0700


The picture on the top of my website was from the Scientific American
article I mentioned below. On my web you can see what my instrument looks

My approach may not be the best route. I have been following the work of
the FMES group ( and the instrument
designed by Dave Nelson (davefnelson@........ that is based on the
resistance of water in a similar two-cup configuration. He uses circuits
with hi-pass coupling, and I was wondering if dc-coupled circuits could
possibly be used to detect earth tides? I am concentrating on getting my
system working, but it might be fun if someone else wanted to look in to
modifying Dave's instrument for ultra-low freq operation.

Thank you for your interest. 

At 04:55 PM 4/4/2007 -0600, you wrote:
>Hi George,  Thanks for the reply,  to me this is great stuff, new to me.
>How is it working for you?   Do you have a larger picture of the unit as 
>illustrated at the top of you wed page?
>I can't see it very well.   Thanks, Ted
>----- Original Message ----- 
>From: "George Bush" 
>Sent: Wednesday, April 04, 2007 4:44 PM
>Subject: Re: Tiltmeter progress
>> Ted-
>> I want to apologize to you and the list for sending a message for Chris
>> Chapman to the whole list (I just hit reply without seeing who it was
>> replying to). I have been interested in Earth tides and have wanted to 
>> make
>> an instrument to measure them. C. L. Strong originally had an article on
>> making a tiltmeter based on two mercury-filled cups connected by a tube 
>> and
>> measuring the level by a capacitance gauge, "A sensitive mercury tiltmeter
>> that serves as a seismometer" Scientific American, November 1973, pp.
>> 124-129. The electronics were updated by an article in Nuts & Volts by Ron
>> Newton, "Measure Earth Tides with a Tiltometer" I ordered a board from 
>> Ron,
>> but was unable to make it work. I have just completed a circuit suggested
>> by Chris based on the Linear Technology LTC 1043 chip and the email to
>> Chris was to let him know how it was working.
>> Check my website at 
>> for further info on my project and references.
>> ...snip...

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