PSN-L Email List Message

Subject: RE: Geophones on ebay
From: "Jack Ivey" ivey@..........
Date: Mon, 20 Feb 2006 12:48:13 -0500

What are you using for a spring?  Is it a special magic "zero length"
or just something from the hardware store?


-----Original Message-----
From: psn-l-request@.............. [mailto:psn-l-request@...............
On Behalf Of John or Jan Lahr
Sent: Friday, February 17, 2006 6:08 PM
To: psn-l@..............
Subject: Re: Geophones on ebay

It's not that hard to make a short period sensor with a period of=20
about 1 second.  I've event been experimenting with one made mostly=20
of wood!  I've posted pictures here:
The period is just over 3 seconds, but at 1 second period it would be=20
even more stable under
changed in temperature.

I actually like the toy store idea and think it would be easy to mass=20
produce a very inexpensive


At 09:59 AM 2/17/2006, you wrote:
>I have to say that such a 1 sec geophone new
>will cost you in the neighborhood of
>$3000 USD so I think people who buy them
>are not too eager to give them up
>at a reduced price. I think those
>geophone people would be doing all us
>amateures a favor to create a lesser quality
>device at 1/10 the cost.
>Maybe if the chinese were to make them
>they could make them cheaper and sell
>them at Walmart in the toy section for the
>Jimmy Neutrons of this Earth.
>Public Seismic Network Mailing List (PSN-L)
>To leave this list email PSN-L-REQUEST@.............. with the body=20
>of the message (first line only): unsubscribe
>See for more information.


Public Seismic Network Mailing List (PSN-L)


Public Seismic Network Mailing List (PSN-L)

[ Top ] [ Back ] [ Home Page ]