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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Wharton & Field's Hydrographical Surveying
From: Robert Eno
Date: 2004 May 9, 16:52 -0400
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?
