CONTENTS. Xi 



PAGE 



Coating of Glass and Porcelain ... .83 



Galvanic Soldering ....... 84 



BRONZING. 



Brown Bronzes ...... 88 



Black Bronzes ...... 89 



Green Bronzes ........ 89 



DEPOSITION OF METALS UPON ONE ANOTHER. 



COATING OF IRON WITH COPPER ... 91 



92 

 93 

 95 

 95 

 96 

 97 

 98 

 98 

 98 

 99 



Cyanide of Potassium, its Manufacture 

 Cyanide of Copper Solution 



Peculiarities in working Cyanide of Copper Solution 

 Preparation of Iron for Coating with Copper . 

 Effects of Conducting Power in Solutions and Metals 

 Illustrations of Conduction 

 Non-Adherence of Deposit 

 COATING or IRON WITH ZINC . 

 Sulphate of Zinc 

 Use of Zinc Coating 

 INFLUENCE OF GALVANISM IN PROTECTING METALS FROM DESTRUCTION 



BY OXIDATION AND SOLUTION . . . . .100 



ELECTRO-PLATING. 



To make Silvering Solution . . . . . .103 



Cyanide of Silver dissolved in Yellow Prussiate of Potash . .104 



Solution made with Oxide of Silver . . . . .104 



Solution made with Chloride of Silver . . . .105 



The best Method of making Silver Solution . . . .105 



Hyposulphite of Silver Plating Solution . . . 106 



Sulphite of Silver Solution . . . . . .107 



To recover Silver from Solutions . . . . .108 



Preparation of Articles for Plating . . . . .108 



Practical Instructions in Plating, . . . . .110 



Taking Silver from Copper, First Method . . . .113 



Second Method . . . . . .113 



Cyanide of Silver and Potassium, its Decomposition during the Plating 



Process . . . . . . . .113 



Other Effects produced in Working . . - .114 

 Machine for moving Goods while subjected to the Electro-Plating 



Process ........ 115 



Deposit dissolving off in Solution . . . . .116 



Opposite Currents of Electricity from Vats . . . .117 



Test for the Quantity of Free Cyanide of Potassium in Solution . 117 



Rate of depositing Silver . . . . . .119 



Bright Deposit of Silver . . . . . .119 



Different Metals for Plating, . . . . . .119 



Electricity given off from Sandy Deposits . . . .120 



The Old Method of Plating . . . . .120 



Advantages of Electro-Plating . . . . . .121 



Objections to Electro-Plating . . . . . .122 



Solid Silver Articles made by the Battery , . . .123 



Dead Silvering for Medals . . . . .125 



