Putnam, G. R. (George Rockwell), b. 1865 · New York, J. Wiley & Sons; [etc.] · leaf 82
sftr 32 35 36 34 Mat 24 37 sft. 26 s ft 24 36 FIG. 20. PORTION OF CHART OF PONCE HARBOR, SCALE 1-20000, TO SHOWSELECTION OF SOUNDINGS FROM ORIGINAL SURVEY GIVEN BELOW … FIG. 21, HYDROGRAPHIC SURVEY OF SAME PORTION OF PONCE HARBOR, REDUCEDTO ONE-HALF SCALE OF ORIGINAL SHEET. (65) PREPARATION OF INFORMATION FOR CHARTS. Chart schemes. Before commencing the prepara-tion of a chart it is necessary to arrange a definite schemefor it, and the usefulness of the chart will…
Nautical charts
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