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    Re: Instrument for HA, Lat ... of points on the Sumner line may be directly obs at sea
    From: Wolfgang Köberer
    Date: 2009 Oct 6, 17:21 +0200

    This instrument has also been described in more detail in:

    Hydrographic Review, Vol. 8 (1931), No. 2, 146 – 153.

    It has been patented in Germany, too, but obviously did not find practical use.


    Dr. Wolfgang Köberer
    Wolfsgangstr. 92
    D-60322 Frankfurt am Main

    Tel: + 49 69 95520851
    Fax: + 49 69 558400
    e-mail: koeberer@navigationsgeschichte.de


    Von: navlist@fer3.com [mailto:navlist@fer3.com] Im Auftrag von Douglas Simpson
    Gesendet: Dienstag, 6. Oktober 2009 16:07
    An: navlist@fer3.com
    Betreff: [NavList 10076] Re: Instrument for HA, Lat ... of points on the Sumner line may be directly obs at sea


    Hi there dw


    First link does not seem to contain any article - second one works fine.



    On Tue, Oct 6, 2009 at 8:14 PM, dw <waldendand@yahoo.com> wrote:

    Appears to be a device which combines the mechanical solution using
    arcs, of the navigation triangle with a bubble sextant and a number of
    prisms.  My quick read says you set the dec, the assumed lat, center
    the object in the bubble, and read out the LHA. OR set dec, LHA,
    center obj and read out lat.  Two settings and sights (assumed/read
    out dec and LHA changing, the Alt may be the same ((or close))), and
    you have you Sumner line!


    and the patent (US Pat 1,852,166):




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