PSN-L Email List Message

Subject: Re: Atmospheric Pressure
From: "Marino De Menech" albalonga@...........
Date: Wed, 15 Oct 2003 14:06:19 +0000

Hi John,

I personally have not heard of any research in that regard but it certainly would be interesting to pursue it further. I would also be interested in a more detailed write up of  how your barometer works.

Marino De Menech

>From: "John D Nelson"
>Reply-To: psn-l@..............
>Subject: Atmospheric Pressure
>Date: Tue, 14 Oct 2003 08:22:15 -0500
>I stumbled into some posts on PSN in the 1996 era regarding atmospheric
>pressure changes and their relation, if any to seismic activity. Has
>there been any further research in this area? (forgive me for being too
>lazy to read 7 years worth of posts to see.) I built an extremely
>sensitive barometer using a manometer and optical switch based on a
>Scientific American article and later modified it into a "dry" version
>using a flexible diaphragm with a magnet on it and a Hall effect sensor.
>It measures pressure indirectly by matching atmospheric pressure with a
>heated chamber and measures the pressure indirectly as temperature
>change of the heated chamber. The liquid version was sensitive to
>within about 3/4 inch of water and the dry one is pretty close to that
>value. It's pretty hard for me to correlate the pressure changes with
>any activity here as seismic activity is pretty small on this piece of
>the globe.
>John Nelson

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