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    Re: Instumental error?
    From: Fred Hebard
    Date: 2005 Apr 20, 14:12 -0400

    On Apr 20, 2005, at 12:21 PM, Alexandre Eremenko wrote:
    
    >>> I know a very clever method of calibrating your sextant
    >>> "at home" that is without stars, but you need a theodolite
    >>> or another instrument more precise than the sextant,
    >>> and with precise level.
    >>> Can describe the method to the list if anyone is interested.
    >>> (I recently read about it in one XIX century paper on
    >>> the Internet).
    >> Please do publish.
    >> Bill
    >
    > The article is available on:
    > http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=
    > 1865MNRAS..25...56T&db_key=AST
    > but I am not sure whether it's free or Purdue pays for
    > subscription.
    >
    > But I am afraid that my conclusion that it is a clever method
    > was somewhat premature:-)
    > Trying to describe it with my own words I found that it is
    > hardly practiceable with the sort of ordinary theodolites
    > I've ever seen:-) A theodolite with hudge objective lens
    > is needed...
    >
    > Alex.
    
    I was able to read the article, so it must be accessible to everybody.
    The "bibcode" is on the second line of your link as I received it.  The
    carriage return needs to be removed from the middle of the link.
    
    I believe Chauvenet mentions calibration with a theodolite, or else the
    Hydrography text (which is home while I'm at work).
    
    I couldn't find mention in this work of the need for a theodolite with
    huge objective lens.  Is that in the original work by Sims?
    
    
    

       
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