In a message dated 2008/02/19, tedr@........... writes:

D> o you think that purpose could be served if the rod was a modified "cotton 
> reel" shape and it rolling on a polished flat plate with a slight bow in it 
> ?

Hi Ted,

       This was my idea, but I am not entirely sure how you would go about 
making it.
       A cylinder moving in a cylinder would work in principle, but I am not 
sure about how you would reduce the friction / link the translational and 
rotational motions. Need to think more carefully.

       Regards,

       Chris   
In a me=
ssage dated 2008/02/19, tedr@........... writes:



D
o you think that purpose could=
 be served if the rod was a modified "cotton reel" shape and it rolling on a=
 polished flat plate with a slight bow in it ?




Hi Ted,



       This was my idea, but I am not entirely=
 sure how you would go about making it.

       A cylinder moving in a cylinder would w=
ork in principle, but I am not sure about how you would reduce the friction=20=
/ link the translational and rotational motions. Need to think more carefull=
y.



       Regards,



       Chris