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    Re: Calibrating a sextant scale
    From: Ken Muldrew
    Date: 2007 Nov 20, 16:04 -0700

    On 20 Nov 2007 at 17:57, Fred Hebard wrote:
    
    > On Nov 20, 2007, at 12:46 PM, Ken Muldrew wrote:
    
    > > A clever method for measuring micrometer eccentricity is described  in a
    > > message from a couple of years ago here:
    > >
    > > http://fer3.com/arc/m2.aspx?i=026728&y=200512
    > >
    > > Ken Muldrew.
    >
    > Yes, but that won't help with scale eccentricity or off-centering of  the
    > pivot.
    
    Right. I should have added that it would be a good idea to check the
    micrometer before doing star-star sights to check the arc, as it might
    take some time before a micrometer error became obvious from the star
    distances.
    
    Ken Muldrew.
    
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