In a message dated 23/03/2008, gpayton880@....... writes:

Chris. do you know of a link showing  this type of device?

Hi Jerry,
 
    Look at the photos in _http://jclahr.com/science/psn/rogers/index.html_ 
(http://jclahr.com/science/psn/rogers/index.html)  There  is another historical 
name for this linkage, dating from the early 1800's,  but I don't remember 
it. It simulates a very long pendulum. There are at  least four sets of 
bearings, so the losses can get important.
 
    Regards,
 
    Chris

 



   





In a message dated 23/03/2008, gpayton880@....... writes:
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  this type of device?
Hi Jerry,
 
    Look at the photos in http://jclahr.com/s=
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is another historical name for this linkage, dating from the early 1800's,=20
but I don't remember it. It simulates a very long pendulum. There are a=
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least four sets of bearings, so the losses can get important.
 
    Regards,
 
    Chris