🚀 go-pugleaf

I recall plans for a simple hobby seismograph in the Amateur Scientist 
section of Scientific American.  I do not have a reference, but I believe
it was back in the days when C. L. Strong wrote the feature.  Essentially
the device consisted of a coil of wire swinging in a magnetic field, with
the output amplified and recorded.  It was interesting to note that
this resulted in a measure of velocity, not displacement (a simple
integrator circuit was described).  The device was not very large, and
it was suggested that it be installed in a basement.
                                                        William Hughes