Hi there Jim,

     If you can get hold of a 50 or 100 micro amp panel meter with a torsion 
ribbon suspension (not a pivot) and mount it with the needle vertical, you can 
then glue a small bit of metal onto the end of the needle and it will act as 
a small seismic sensor. Meters with pivot suspensions generally have too much 
friction to be reliable. 
     If you make the added mass out of thin Al sheet, you can then damp the 
motion more using magnets, if need be. The meter movements themselves are 
usually designed to be overdamped, but adding more mass to the end of the neede is 
likely to allow them to oscillate.

     Regards,

     Chris Chapman  
Hi there Jim,



     If you can get hold of a 50 or 100 micro amp panel=20=
meter with a torsion ribbon suspension (not a pivot) and mount it with the n=
eedle vertical, you can then glue a small bit of metal onto the end of the n=
eedle and it will act as a small seismic sensor. Meters with pivot suspensio=
ns generally have too much friction to be reliable. 

     If you make the added mass out of thin Al sheet, yo=
u can then damp the motion more using magnets, if need be. The meter movemen=
ts themselves are usually designed to be overdamped, but adding more mass to=
 the end of the neede is likely to allow them to oscillate.



     Regards,



     Chris Chapman