Hi

In my planning of building a PVC seimsmometer, I also plan to build a Lehma=
n seismometer, if I can keep it small enugh. But I need a suggestion for ma=
terial and some mesurements and proper drawings before I can start. I also =
want to keep the frequancy of the Lehman seismometer around 1Hz.

Regards.
J=F3n Fr=EDmann.
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