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    Re: SNOT at large angles
    From: Fred Hebard
    Date: 2004 Nov 1, 11:31 -0500

    Alex,
    
    WarrenKnight instruments in Philadelphia, PA, is the only location in
    the U.S. of which I am aware that _might_ check the arc error in your
    sextant.  There's a sextant shop in the Pacific NW that will check the
    collimation.  You also can do that yourself following instructions in
    Bowditch.
    
    However, you might want to run a few more lunars at large distances
    before concluding that your arc is in error.
    
    Fred
    
    On Nov 1, 2004, at 9:51 AM, Alexandre Eremenko wrote:
    
    > Dear Frank,
    > Are there any sextant experts in Chicago,
    > to whom I could show my sextant to collimate
    > and determine the arc non-uniformity error?
    > I just don't want to send it by mail again,
    > but Chicago is the place I can easily come to.
    > Alex.
    
    
    

       
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