a facsimile, for use in printing, of a block of type, an engraving, or the like, consisting of a thin shell of metal (copper or nickel), deposited by electrolytic action in a wax, lead, or plastic mould of the original and backed with lead alloy.
a facsimile, for use in printing, of a block of type, an engraving, or the like, consisting of a thin shell of metal (copper or nickel), deposited by electrolytic action in a wax, lead, or plastic mould of the original and backed with lead alloy.