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    Re: The repeating circle.
    From: Alexandre Eremenko
    Date: 2005 Jan 9, 14:04 -0500

    Dear George,
    I will look into Chauvenet and try to reply your
    main question shortly. Now I have comments on another
    part of your message:
    On Sat, 1 Jan 2005, George Huxtable wrote:
    > Unfortunately, such repeating circles
    > are precious museum objects so I
    > don't expect ever to get a chance
    > to try one out
    Working replicas of reflecting circles are
    made (of brass) by some British companies, like Stanley and Sestrel
    (they also make imitation sextants and, to my surprise,
    theodolites). These copies pop up sometimes on the web for
    very moderate price. I just returned from Istanbul, where
    I visited the famous Grand Bazar, where I saw a lot of such copies.
    Typical prices are under $100 (if they see that you understand that
    this is a copy, not a real thing:-) and even this is very  much
    negotiable. (I saw imitations of a "Troughton" "column frame" sextant
    in a nice wood box for $100 and a very good looking
    "Troughton" theodolite with a tripod
    was sold
    in my presence for $400. There were also several reflecting circles,
    "pocket sextants"
    and brass astrolabias.
    Unfortunately, the word "working" I used above needs some
    qualification: I mean all parts are present and move as they should,
    but the joints are quite loose and
    the precision of all these intruments is probably less than that
    of a cardboard sextant.

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