Hi James Fisher-- I enjoy reading your mails because you're so inventive
with your ideas, keep up the interesting work! It is individual small scale
experimentation with ideas that have almost entirely furthered the cause of
science!
I don't have any doubt you can fabricate your own Lehman or other seismos--
but the idea of geophones is a large suspended mass surrounded by a coil so
when the mass moves (technically not correct, but for purposes of this
email...) the coil outputs a waveform consistent with its movement. Although
a meter movement is a coil, the needle and magnet assembly lacks the mass to
output a low frequency waveform, although for a short period higher
frequency (fast oscillation) temblor it might work. What the heck, try it
and see!         Tom D.


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