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glapook@PACBELL.NET wrote:


 The description of the Sumner method starts on page 186. On page 212 it
discusses "The New Navigation, " invented by Marq St. Hilaire. On page
213 it states " This is but another method of determining a line of
position, or Sumner line, and among intelligent navigators both of the
navy and merchant marine, this method has almost entirely supplanted the
old time sight for longitude, and the chord and tangent method for
obtaining the sumner lines..."



http://books.google.com/books?id=lPY3AAAAMAAJ&pg=PA57&lpg=PA57&dq=bowditch+table+19&source=web&ots=fIIPgeqDiF&sig=7fyZpZS2IVzy2AIZMv4fP28J1Dw



gl


>Here is a link to a 1909 navigation textbook that discusses St.
>Hilaire, and the tangent and chord Sumner methods. Go to page 212 of
>the text to start (page 224 if you download the pdf of the entire
>book)
>

>http://books.google.com/books?id=lPY3AAAAMAAJ&pg=PA57&lpg=PA57&dq=bowditch+table+19&source=web&ots=fIIPgeqDiF&sig=7fyZpZS2IVzy2AIZMv4fP28J1Dw
>
>gl
>
>


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