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    Re: Dip
    From: Fred Hebard
    Date: 2004 Dec 1, 23:25 -0500

    On Dec 1, 2004, at 1:06 AM, Alexandre Eremenko wrote:
    
    > By the way, Shufeldt in his paper
    > "Irradiation and refraction at low altitudes and the working
    > navigator" (Journ of The Inst. of Nav., 4,2, 1954) claims that....
    >
    > One place in this paper was expecially interesting for me:
    > he says that
    >
    > "to my surprise, attempting to establish index error with
    > a close degree of accuracy proved to be the most difficult
    > part of the whole operation".
    >
    > This is very well confirmed by my own experience.
    > (I recently posted the data of such observations).
    > Unfortunately, he does not try to explain why this is so.
    >
    > Alex.
    >
    >
    
    
    Alex,
    
    That's also my impression, and the difficulty is holding the sextant
    sideways.
    
    Fred
    
    
    

       
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