Modern electro plating The principles involved in depositing gold, silver, nickel, copper, brass and other metals, by means of batteries or dynamos; the preparation and management of plating baths, chemicals used, etc . Fig. To Amalgamate Zincs. This may be very welldone by first immersing the zincs in a solution of dilutesulphuric acid and then in a bath of mercury. A brush MODERN ELECTRO PLATING. 2 5 or cloth may be used to rub them, so as to reach allpoints of the surface. Where a large quantity is to beamalgamated, the following will be found to be a goodmethod: Dissolve eight ounces of me
Modern electro plating The principles involved in depositing gold, silver, nickel, copper, brass and other metals, by means of batteries or dynamos; the preparation and management of plating baths, chemicals used, etc . Fig. To Amalgamate Zincs. This may be very welldone by first immersing the zincs in a solution of dilutesulphuric acid and then in a bath of mercury. A brush MODERN ELECTRO PLATING. 2 5 or cloth may be used to rub them, so as to reach allpoints of the surface. Where a large quantity is to beamalgamated, the following will be found to be a goodmethod: Dissolve eight ounces of mercury in a mixtureconsisting of two pounds of hydrochloric and one poundof nitric acid; when the solution is complete, add threepounds more of hydrochloric acid. The zinc is amalga-mated by immersing it in this solution for a few seconds,quickly removing to a vat of clear water and rubbing it,as in the first case, witha brush or cloth. If thesolution is kept in acovered vessel it may beused a number of times. In all batteries in c~which acids are used the. Fig. 8. zincs should be kept well amalgamated and should beremoved from the solution when not in use. This isvery important and should not be overlooked. Improved Electropoion Fluid* Add one part (byvolume) of sulphuric acid to ten parts of water. Of 10pounds (or pints) of the dilute acid, add from 1 to 2pounds of chromic acid, according to the strength of cur-rent desired. Where constant action over a long time 26 MODERN ELECTRO PLATING. is desired rather than maximum energy, omit partor all of the sulphuric acid. Bichromate of potash is no longer used for batteriesby intelligent workers. It owes its virtues to a smallamount of chromic acid which can be obtained from it byreaction. Pure chromic acid is cheaper for the samework, and is free from many of the difficulties attendanton the use of the bichromate. Connections. Having a knowledge of the theoreti-cal action of the battery, the next question is the con-nections. Clean
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectelectro, bookyear1897
