Wright, Mark R., 1854- · London : Longmans · leaf 231
. 222). Electrotyping.—A mould of the object (sav a coin) is taken in 222 Voltaic Electricity guttapercha or plaster of Paris, both non-conducting substances. To make the surfaces conductors,they are brushed carefully withgraphite (fig. 223). The mouldis then attached to the zinc endof a voltaic…
Physics
Internet Archive · Cornell University Library · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Abercrombie & Fitch Co., New York : Christmas Catalogue, 1916] (1916)](https://img.insideoutlibrary.com/img/200/ia-abercrombiefitch00aber_0-26-50.webp)
