St. John, Thomas M. (Thomas Matthew), b. 1865 · New York, T. M. St. John · leaf 64
AND ELECTROTYPING. 6i Great care is used in cleaning substances to be plated,all dirt and grease being carefully removed. Fig. 80 shows a plating bath in which several articlescan be plated at the same time by hanging them upon ametal bar which really forms a part of the cathode. If,for example, we… … Fig. 80. a silver plate having a surface about equal to that of thecombined knives, etc. Most metals are coated with copper before they areplated with silver or gold. When plating is done on alarge scale, a current from a dynamo is used. Forexperimental purposes a Gravity cell will do very…
Electricity
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