Putnam, G. R. (George Rockwell), b. 1865 · New York, J. Wiley & Sons; [etc.] · leaf 154
pends of course on the accuracy of the chart, andcaution must be used where it is not certain that thechart depends upon an accurate survey. Soundings. Even if objects cannot be seen, due todistance or thick weather, the chart furnishes a valuableaid when a vessel has approached within the…
Nautical charts
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
