The Map Maker in a Changing World. The wax-engraved plate goed into an electrotype bath where a thin shell of copper is deposited by electrolysis, making a reverse image in relief of the engraved patch. Leo Sealy is examining the electrotype.
The Map Maker in a Changing World. The wax-engraved plate goed into an electrotype bath where a thin shell of copper is deposited by electrolysis, making a reverse image in relief of the engraved patch. Leo Sealy is examining the electrotype.
The Map Maker in a Changing World. The wax-engraved plate goed into an electrotype bath where a thin shell of copper is deposited by electrolysis, making a reverse image in relief of the engraved patch. Leo Sealy is examining the electrotype.