Hi all:
          I have two very old seismometers and I would like to extend 
their "periods", electronically and EXTERNALLY if that is possible. I 
tried this a long time ago but I am not heavy into electronics and could 
not come up with the right values for some of the circuits that I looked 
at. The two Seismometers are a Kinemetric SH1 "Intermediate"(about 5 
second period), and a Sprengnether (square box type) with a 1.5 second 
period. Is it possible to do this easily and is there a circuit 
somewhere with relatively simple instructions for calculating component 
values? Thank You.  Ed.

__________________________________________________________

Public Seismic Network Mailing List (PSNLIST)

To leave this list email PSNLIST-REQUEST@.............. with 
the body of the message (first line only): unsubscribe
See http://www.seismicnet.com/maillist.html for more information.