Putnam, G. R. (George Rockwell), b. 1865 · New York, J. Wiley & Sons; [etc.] · leaf 104
FIG. 28. ENGRAVING SOUNDINGS ON A COPPER PLATE WITH A MACHINE. (85) … Copper Plate 89 The work thus marked out is engraved by hand or bymachine. A high degree of skill is required in theaccuracy and finish necessary for chart engraving.Machines have been invented in recent years which canbe used for portions of the work on copper plates, asfor instance for cutting…
Nautical charts
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