Nautical charts . Survey several different processesare in use at present; charts are engraved on copperand printed directly from the copper plate, or they aretransferred from the copper plate to stone and printedfrom the stone, or a finished drawing is made andtransferred to stone by photolithography and printedfrom the stone, or an etching is made on copper from afinished drawing and printed from a transfer to in other countries are in large part printed fromengraved plates, excepting some preliminary charts bylithography. Copper plate engraving and printing have long beenused i
Nautical charts . Survey several different processesare in use at present; charts are engraved on copperand printed directly from the copper plate, or they aretransferred from the copper plate to stone and printedfrom the stone, or a finished drawing is made andtransferred to stone by photolithography and printedfrom the stone, or an etching is made on copper from afinished drawing and printed from a transfer to in other countries are in large part printed fromengraved plates, excepting some preliminary 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 photography a matrix is made from thedrawing and a wax impression taken from this is then laid down on the copper to fit the projection,and the impression is chemically fixed on to the copper. 84. FIG. 27. ENGRAVING A CHART ON A COPPER PLATE.
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Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookp, booksubjectnauticalcharts
