Putnam, G. R. (George Rockwell), b. 1865 · New York, J. Wiley & Sons; [etc.] · leaf 102
nary charts bylithography. Copper plate engraving and printing have long beenused in chart preparation. A drawing is prepared asa guide for the engraver; this must be correct as to allinformation to be shown but need not be a finisheddrawing. A true projection is ruled upon a copperplate. By… … FIG. 27. ENGRAVING A CHART ON A COPPER PLATE.
Nautical charts
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