Putnam, G. R. (George Rockwell), b. 1865 · New York, J. Wiley & Sons; [etc.] · leaf 42
n on the chart, with abbreviationsindicating the nature of the bottom. Depth curvesare drawn, joining together points of like depth, andinclosing areas of less depth, on the same principlethat contours are used on land maps; usually also theshoaler spots are made more prominent by sandingor tinting… … Cliffs and Rocky CoastLine„ Rocky Ledges Low Water Line andSa?id Dunes Deciduous Trees. Pine Trees. Palms Curves of equal eleva-tion and intermediatecurves Salt Marsha Coral Ledge coveringand uncovering (fathom curve,shoum thus 10 and ioo fm. curves,shown thus:
Nautical charts
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