[email protected] said: > The reason that I remember a hard vacuum is not used is because the > low pressure is used to rate the pendulum (fine tune) by slightly > increasing or decreasing, and in a hard vacuum metals tend to weld > together and oils evaporate so the mechanical bits seize up.
How does the pressure change the frequency? Why are oils a problem? I thought typical pendulums used a spring rather than a bearing. That does raise an interesting issue. How would you fine tune a pendulum? If you can get close enough, then you can tweak things by varying the amplitude, or temperature. Big Ben is tuned by adding/removing a penny from the pendulum. http://en.wikipedia.org/wiki/Big_Ben (search for penny) That technique gets more interesting in a vacuum, but you might be able to rig up something equivalent. -- These are my opinions, not necessarily my employer's. I hate spam. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
