Hi all,

This web page is of a novel but likely dated ~1 second pendulum, that could
respond to vertical and horizontal
mass movements.  What the heck; it is kind of interesting...but it would
likely need high gain sensors.
No springs necessary.  A possible "twofer"....the price of one support
frame.  The bottom pic is probably the best.

http://seismometer.googlepages.com/vh

Take care, Meredith
Hi all,
 
This web page is of a novel but likely dated ~1 second pendulum, that could respond to vertical and horizontal
mass movements.  What the heck; it is kind of interesting...but it would likely need high gain sensors.
No springs necessary.  A possible "twofer"....the price of one support frame.  The bottom pic is probably the best.
 
http://seismometer.googlepages.com/vh
 
Take care, Meredith