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Old 8th Feb 2009, 13:12
  #45 (permalink)  
Join Date: Aug 2006
Location: Bedford, UK
Age: 40
Posts: 313
The spring steel is a nice idea, except that you then run into hysteresis, some of the energy from the pendulum goes into heating the metal up and is "lost"

A well made ruby bearing will lose far less energy than a spring pivot. (and this is, indeed, the origin of the "jewels" in a watch. Originally it referred to the number of jewelled pivots.)
matt_hooks is offline