Hello Chris;

http://jclahr.com/science/psn/chapman/lehman/index.html

Yes, I like that design very much.

Do you make a vertical version of that
with a spring where the wire is ?

I would like very much to either buy a kit or the plans
from you to build my own vertical.
I lack talent in your area I need help
to make a decent sensor.

Vertical is my only interest
unless I can get a planer type
sensor in the horizontal.
Meaning a single sensor for both EW/NS.

Please email me the details.

gmvoeth@...........
gmvoeth@.........
gmvoeth@.........

any one of those three addresses.

I have seen a novel sensor at ASU about 1985
where two masses are N/S and E/W but
vertically at a 45 degree angle or so
making it possible to reproduce three dimensional
motion with only two sensors.
Or so it seemed to me.
I have never seen that design on the Internet.

regards;
geoff

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