Are you by chance talking about
a float on water connected by lever
arm to a potentiometer ?
Possibly a strain guage of some kind ?
i know there more to it than that,
but this should be the basic idea ?

geoff

----- Original Message ----- 
From: "Chuck / Judy Burch" 
To: 
Sent: Monday, August 01, 2011 10:18 AM
Subject: Pot and Tube Horizontal Seismometer


> 
> All,
> 
> I believe there is an error in the FMES spreadsheet just posted.  The 
> correct natural frequency for a "pot and tube" tiltmeter/horizontal 
> seismometer is:
> 
> (omega nought)^2 = ((3/2) g)/(2L +l(R^2/r^2)),
> 
> where g is acceleration due to gravity, L is height of liquid in the 
> pot, l is length of the tube, R is pot radius and r is tube radius.  The 
> complication is due to non-uniform speed of liquid flow in a tube, 
> maximum at the center, zero in contact with the tube.  Steen and Casey, 
> Theory of the Manometer Accelerometer, Rev Sci Instr, Nov., 1953, 
> p1021-1028.  gives a complete derivation.
> 
> Chuck Burch
> __________________________________________________________
> 
> 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.
__________________________________________________________

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.