In a message dated 2008/09/20, tchannel1@............ writes:

> Hi Folks,  This is one approach I have not tried.  
> http://www.phy.mtu.edu/~suits/PH3110/pendulums.html
> Has anyone built one, as a mock up to see the results?
> If someone would suggest some dimensions, I would like to try it, to see how 
> it would work and the period possible.

Hi Ted,

       I suggest that you forget these systems in general. The X suspension 
shown is quite bulky and the high swire stresses are likely to give problems.

       We were considering the LIGO variant where the mass is mounted on a 
stalk on top of the lower plate. By varying the mass height above the lower 
plate, you can vary the period. The whole setup can be quite compact. You can also 
use rolling wire or foil suspensions for easy construction and very low 
intrinsic noise.

       Regards,

       Chris Chapman   
In a message dated 2008/09/20, tcha=
nnel1@............ writes:



Hi Folks,  This is one app=
roach I have not tried.  http://www.phy.mtu.edu/~suits/PH3110/pendulums.html=


Has anyone built one, as a mock up to see the results?

If someone would suggest some dimensions, I would like to try it, to see ho=
w it would work and the period possible.




Hi Ted,



       I suggest that you forget these systems=
 in general. The X suspension shown is quite bulky and the high swire stress=
es are likely to give problems.



       We were considering the LIGO variant wh=
ere the mass is mounted on a stalk on top of the lower plate. By varying the=
 mass height above the lower plate, you can vary the period. The whole setup=
 can be quite compact. You can also use rolling wire or foil suspensions for=
 easy construction and very low intrinsic noise.



       Regards,



       Chris Chapman