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    Re: Dip of the horizon
    From: Fred Hebard
    Date: 2004 Nov 15, 20:44 -0500

    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....
    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.

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