Ted,
Yes, that thought had occurred to me, too.  One possibility would be to 
find a flat piece of standard window pane, mount it, and provide tension 
screws to physically pressure it into the desired curve.  After all it 
is only 0.001" in 1".  I think glass would bend that much.
Charles Patton

Ted Rogers wrote:
> Charles,
>  
> You could create the same "rolling" effect by having 2 narrow plates a 
> short distance apart on the upper edge of each a shallow curve of 
> about 1000' radius. On these you sit a ground and polished rod of, 
> say, 2" (~50mm). I'm sure this would give the same effect as your 
> cylinder, the only problem being of course - the creation of the 
> curves. The measurement of any movement of the rod could be done by 
> some sort of optical sensor looking either up or down passed a 
> narrower extension of the rod, or even a flat reflective surface 
> attached to one end of the rod...
>  
> Regards
>  
> Ted
>  
> >

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)