NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Dip of the horizon
From: Fred Hebard
Date: 2004 Nov 15, 20:44 -0500
From: Fred Hebard
Date: 2004 Nov 15, 20:44 -0500
Alex, Captain H.H Schufeld of the U.S. Navy published a paper in 1962 in the Journal of the Royal Institute of Navigation on pages 301-324 of volume 15, entitled "Precision Celestial Navigation Experiments." In it, he mentions and illustrates a Gavrisheff dipmeter. I _guess_ that the instrument looks at the horizon in both directions and aligns images of the two horizons, measuring the angle, much like you would with a sextant measuring the height of church steeple. One of the experienced fellows here also recommended a book entitled "Hydrographical Surveying" by Wharton and Field. I have found this book very interesting. The book doesn't discuss dipmeters, but.... Fred On Nov 15, 2004, at 8:08 PM, Alexandre Eremenko wrote: > On the other hand, the Russian book recommended to > "always check the dip with "naklonomer" whenever possible, > and to obtain high precision"). > Did any analogous devise exist in the West? > How was it called then? > How did it work? > Alex.