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    Re: Sextants, vernier and micrometer.
    From: George Huxtable
    Date: 2006 Oct 30, 19:58 -0000

    Alex asked-
    
    | Could you look at the picture of the vernier
    | of that Hezzanith on e-bay we just discussed:
    | http://www.math.purdue.edu/~eremenko/pic1.jpg
    | It is supposed to provide 0.2' reading.
    | What do you think of it?
    
    The Vernier looks fine to me, and the part of the main arc that's
    shown in the picture looks reasonable. I don't think you can expect to
    get anything much better than that. There are slight defect marks but
    nothing that upsets the pattern of the two sets of divisions where
    they meet. If the rest of the arc is as good then it's worth going
    for.
    |
    | One more request. As I understand, you had that
    | bad sextant (which you returned) in your possession
    | for few days. Could you recall some detail about
    | it which would permit to exclude the possibility that
    | this one is the same?
    |
    | Like the number and power of the scopes. Presence/absence
    | of eyepiece filters?
    | Anything about the certificate?
    | Was it a 10" reading vernier? (This one is 0.2' reading).
    
    Yes, I had that instrument overnight. Luckily, we chose to stay in a
    nearby hotel for the night rather than driving straight back to
    Oxford.
    
    I don't recall all the details and no longer have the photos but it
    doesn't look quite the same. As I remember, that one was graduated to
    10 seconds on the Vernier, like my present sextant, rather than to
    0.2', as is the one for sale. I don't regard that slight difference in
    resolution as at all significant. Indeed, graduation to decimal parts
    of a minute fits in better with current ways of working and reading
    the almanac than does a reading in seconds, to tens.
    
    George.
    
    contact George Huxtable at george@huxtable.u-net.com
    or at +44 1865 820222 (from UK, 01865 820222)
    or at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK.
    
    
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