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    Re: Instrument for HA, Lat ... of points on the Sumner line may be directly obs at sea
    From: Douglas Simpson
    Date: 2009 Oct 6, 22:07 +0800
    Hi there dw
     
    First link does not seem to contain any article - second one works fine.
    Regards
    Doug

    On Tue, Oct 6, 2009 at 8:14 PM, dw <waldendand---.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!

    http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?1927PASP...39..305K&data_type=PDF_HIGH&whole_paper=YES&type=PRINTER&filetype=.pdf

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

    http://www.google.com/patents/download/A_COPARTNERSHIP_CONSISTING_OF.pdf?id=gYFZAAAAEBAJ&output=pdf&sig=ACfU3U3ICy-mooq_x6rZq2CH-C2rAiDK4A

     H-C2rAiDK4A

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