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    Re: Timing Lunars with a Rock
    From: Frank Reed CT
    Date: 2005 Jul 19, 17:40 EDT
    Henry Halboth wrote:
    "With a little practice, counting "and 1 - and 2 - and 3, etc." will
    really serve the same purpose. Before I could afford a stop watch the
    time between sight and chronometer reading was often accounted for in
    this manner."
     
    In experimental tests, I get errors of about 3 seconds per minute by counting. That's 5%. By contrast, a crude pendulum should be accurate to about 3 seconds in ten minutes or 0.5%.
     
    Also note that the "clock" mechanism of a crude pendulum is still verbal counting. As with an ordinary pendulum clock, the swinging pendulum in this case only serves to regulate the beats.
     
    -FER
    42.0N 87.7W, or 41.4N 72.1W.
    www.HistoricalAtlas.com/lunars
       
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