Use of Transparent Plastics in Stereotopographic Work

摘要

A brief description is given of three distinct uses of plastics in the compilation of maps on universal instruments: (1) direct engraving of a publisher's original in an engraving coating, with separation as regards map content (relief, contours, hydrography); (2) engraving of a compiler's original (without separation); and (3) production of a compiler's sketch original that serves as basis for engraving a publisher's original.