Hydrographical surveying : a description of means and methods employed in constructing marine charts (1920)
Wharton, W. J. L. (William James Lloyd), 1843-1905, Field, Arthur Mostyn, 1855- · London : J. Murray · leaf 398
another resulting Sumner line, C D.Transferring the two first lines by the run as before, we nowhave three lines intersecting, or nearly so, at P, and by theircoincidence or not we can measure the accuracy of our former CHAP. XVI.] SUMNERS METHOD 371 positions—to a certain extent, that is, for it… … pi3 n/* Fig-, 72. considerably in error, even when the third intersection isobtained, with certain arrangements of the lines and the run.Sumners method is, in fact, the means by which all indi-vidual observations can be combined, and is from every point ofview invaluable. NEW NAVIGATION. The method…
Hydrographic surveying · Nautical charts
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