This art has for its objects the coating of metallic articles with
other metals of more value, beauty, or durability, such as gold,
silver, or copper, by means of electricity, and the formation (by
the same means) of other articles by the deposition of metals, from
liquids containing them, upon moulds or engraved surfaces capable
of modelling them. When the deposit forms a coating intended to be
permanent, and which adheres to the article so as to be incapable
of removal, it is called “electro-plating,” but when a fac-simile of
any surface is required, or a cast of a mould which may be removed,
forms the object to be produced, it is called “electrotyping” or
“electro-depositing.”