Sorry to all about the broken link.  A bonehead mistake right up there with
forgetting the attachment...

www.bryantlabs.net/seismo.html

Thanks, it was a "labor of love"!  And it was not that hard to make.
Mechanically, it is pretty simple, I think most people are put off by the
electronics.  Sean-Thomas's version was put together from some universal
boards which had many options which are unused for this seismometer.  It
also lacked a diagram which pulled all of the pages together.

The spring hinge gave me some problems as well.  I'll try to get a detail of
it, as well as some kind of sketch posted soon.  One hint I can give is that
the ends of the spring are pulling, not pushing.

If you picture the spring as a "C", each end has a piece of brass strip
attached which points inward.  That strip is attached to the spring along
one edge, and the hinge "pin" (a piece of brass rod) on the other.

Would there be any interest among the group if I made a PCB and some of the
hard to find electronic parts available?  I did not copy Sean-Thomas's
circuit, so there isn't a copyright issue.

Cheers,

Keith Payea
Santa Rosa, CA
38.46N 122.71W

----- Original Message -----
From: "Larry Conklin" 
To: 
Sent: Tuesday, June 17, 2003 8:39 AM
Subject: Re: Pictures and drawings of my system


> Keith,
>
> I was really pleased to see your description of your vertical seismometer.
> I have been thinking about building one also, but some of the details in
the
> original plans have been unclear to me.  Your photos make the whole
> enterprise look much less daunting than I had thought.  The one detail
that
> is still not clear to me is the design of the hinges at the ends of the
> spring.  I wonder if you have comparably clear photos of them that you
could
> add to your web page?
>
> Larry Conklin
> Liverpool, NY
>
> ----- Original Message -----
> From: "kpayea" 
> To: 
> Sent: Monday, June 16, 2003 11:49 PM
> Subject: Pictures and drawings of my system
>
>
> > Hello all:
> >

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