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    Re: Leap seconds at Big Ben.
    From: Bill Morris
    Date: 2009 Jan 1, 11:32 -0800

    The regulating weight is usually half to two thirds of the way up the 
    pendulum. It has maximum effect at the half-way point, but it looks better a 
    little higher. Adding weights to the top of the pendulum bob does work, but 
    they have to be heavier. On the home-made regulator clock whose picture I 
    include as an attachment, I use increments of 100 milligrams and can achieve 
    a rate of two or three seconds a month, but as the brass-compensated Invar 
    pendulum rod is not (yet) correctly compensated, the rate changes with the 
    season.
    
    Bill Morris
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