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








Charles,
 
You could create the same "rolling" =
effect by=20
having 2 narrow plates a short distance apart on the upper edge of =
each a=20
shallow curve of about 1000' radius. On these you sit a ground and =
polished rod=20
of, say, 2" (~50mm). I'm sure this would give the same effect as your =
cylinder,=20
the only problem being of course - the creation of the curves.=20
The measurement of any movement of the rod could be done by some =
sort of=20
optical sensor looking either up or down passed a narrower extension of =
the rod,=20
or even a flat reflective surface attached to one end of the=20
rod...
 
Regards
 
Ted
 
<tedr@...........>