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    Re: Dip of the horizon
    From: Alexandre Eremenko
    Date: 2004 Nov 15, 21:12 -0500

    Dear Fred,
    That is clever: to measure the dip in two
    opposite directions and compare!
    I am almost sure that Captn Schufeld somewhat misspeled the name of
    the inventor. Do you have access to this paper?
    P.S. My impression was that these were not just experiments.
    The book I read was a sort of a manual for navigators,
    and it mentionmed the device as something common;
    it even did not describe its use or construction.
    On Mon, 15 Nov 2004, Fred Hebard wrote:
    > 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.

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