Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 122
„^o» i{- V /r^ =M / .■■■••■■■< « / . s. / ,■■■■■ -^ <3i … Fig. 236. line, generally that of high water, the low-water line being usually representedby a single continued line. The soundings are expressed in fathoms or in feet.Fig. 236 is a map of Cape Cod Bay plotted by this method. The depths areexpressed in feet, and the dotted lines are contour-lines…
Mechanical drawing
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