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    Re: Wharton & Field's Hydrographical Surveying
    From: Robert Eno
    Date: 2004 May 9, 16:52 -0400

    Fred Hebard wrote (a quote from Wharton & Field's):
    
    > For these observations in an artificial horizon, Wharton recommends an
    > eypiece shade rather than the swing-out sextant shades.  He also
    > recommends multiple eyepiece shades of varying optical density.  He
    > discusses examination of errors caused by swing-out sextant shades.
    >
    
    Robert responds,
    
    I don't know if I buy the bit about swing out sextant shades introducing
    errors. Perhaps this was true back when that book was written, however can
    the same be true for modern sextant shades?
    
    
    

       
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