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    Centring Error Detector
    From: P Posth
    Date: 2007 Jan 11, 01:21 -0800

    Hello,
    I'm looking for information about "Centring Error Detectors", machines
    to verificate and evaluate centring error of sextant.
    Here is an exampe of this kind of instrument :
    http://bib.iota.u-psud.fr/Record.htm?idlist=3&record=894512461279
    Here is an other kind :
    http://gita.grainger.uiuc.edu/IOPText/0950-7671/6/10/408/siv6i10p324.pdf
    
    Do you know
    - if exist a book describing precisely the use of this instrument,
    - if exist always a manufacturer of this instrument
    - any other information or comment is welcome.
    
    Thank you and happy new year.
    
    
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