PSN-L Email List Message

Subject: [Fwd: Horizontal Pendulum]
From: Larry Cochrane lcochrane@..............
Date: Fri, 21 Oct 2005 23:36:52 -0700

-------- Original Message --------
Subject: Horizontal Pendulum
Date: Fri, 21 Oct 2005 20:33:15 -0400
To: Larry Cochrane 

Larry, thank you for your reply. The PSN-L@............... did not work. (i don't 
have good computer skills.) Would you post this on the list? i'm new to the list and 
seismology. i've enjoying reading the posts and have been thinking about a horizontal 
pendulum Lehman type seismo using metal shims (what is the best material for shims 
and best thickness?)    Anyway, the horizontal pendulum would be supported by shims 
above and below the pendulum that are ninety degrees perpendicular to the horizontal 
axis of the pendulum.  The upper shim would be attached to the 'mast'  and then to a 
tube or rod that is attached to the pendulum, again with the linear axis will be 
perpendicular to the pendulum's horizontal plane.  This would place the upper shim in 
tension. The lower shim is also placed in tension by attaching the end away from the 
coil to the above mentioned tube or pipe that is attached to the pendulum. The lower 
shim will run away from the mast towards the coil. One thing that will have to be 
determined is the position were the upper and lower tubes join the pendulum. The 
tubes' positions would determine the flex positon of the shims, hopefully to be able 
to find the point of greatest flexion of the shims with the lowest torque needed to 
cause the flex or bending of the shim. Have many people tried this? How did it work? 
Thanks, geofffrey roberts, Crystal River, Florida


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