150 



INDEX. 



Plaster of Paris coated with Cop- 

 per, 17. 



Moulds, how taken, 



54. 



taken from Plaster 



Models, 57. 



Platinode, 23. 



Plating, Electro, 103. 



Solution, how prepared, 103. 



Practical Instructions in, 1 10. 



in large factories, 110. 



Metals best suited for, 119. 



Old Method, 120. 



Platinum, coating with, 135. 



Plumbago, as a conducting medium, 

 discovered, 17. 



Phosphorus Solution for reducing 

 Gold and Silver, 62. 



Poles positive and negative, denned, 

 24. 



Porous Vessel and Diaphragm, 48. 



Porcelain covered with Copper, 83. 



Potassium, Cyanide of, mode of pre- 

 paring it, 92. 



cost of making, 94. 



Potash, Sulphite, how prepared, 107. 



Position of Electrotypes in Solu- 

 tions, 75. 



Printing by Electrotype Plates, pro- 

 posed by Spencer, 10, 16. 



difficulties experienced in pre- 

 paring plates for, 12. 



by Electrotypes, 79. 



of Leather by Electrotypes, 80. 



by Glyphography, 83. 



Preventing Electrotypes adhering, 15. 



Preparation of Non-metallic Moulds 

 for receiving deposit, 60. 



Glyphotypes, 82. 



Transfer Paper, 83. 



Articles for Plating, 110. 



Solutions of Gold, 128. 



Silver, 103. 



Practical Instructions in Plating, 110. 



Objections to Solid Deposit, 125. 



Suggestions on Gilding, 133. 



Precautions on putting Moulds into 

 Solution, 61. 



Properties of Metals fit for Batte- 

 ries, 29. 



Principles of Galvanic Protection, 100. 



Protection of Silver Coating, 109. 



Surface, 126. 



Process of Gilding, 128. 



Quantity of Cyanide of Potassium 

 to precipitate 100 ounces of Sil- 

 ver, 104. 



Quantity of Nitric Acid to dissolve 

 100 ounces of Silver, 104. 



Quality of Magneto Machines, 45. 



Quality of Metal regulated by Battery, 

 109, 123. 



Rate of depositing Silver, 119. 

 Recovery of Silver from Solution, 108. 

 Regulating of the Colour of Gilding, 



131. 



Relative Intensity of Batteries, 73. 

 Removing of Grease or Oil from 



Metals, 95. 



Rosin and Wax Moulds, 54. 

 Resistance, effects on deposits, 65, 72. 

 Retorts, coating of, objection to, 84. 

 Reptiles, moulding of, 57. 



Sal Ammoniac, solution of, for Bat- 

 teries, 57. 



Salt, solution of, for Batteries, 51. 



Salts of Cyanide of Copper and Po- 

 tassium, 93. 



Sand used for Scouring, 109. 



Sandy Deposit, electricity from, 120. 



Scratch Brushes, 109. 



Single cell, 18. 



, experiments with, 47. 



Silver Salts reduced by Phosphorus, 

 63. 



solutions for Plating, 103, 104, 



105 106. 



dissolved in acids, 97, 104. 

 Oxide of, dissolved in Cyanide 



of Potassium, 104. 

 Chloride of, dissolved in Cya- 

 nide of Potassium, 105. 



recovered from Solutions, 108. 

 curious alloy of, 108. 



hardness of, effected by Battery, 



109. 



Mounts in the old process, 121. 



articles made by Battery, 123. 



solution for making solid arti- 

 cles, 123. 



made by Electrotype, objections 



to, 125. 



protection of, in Air, 126. 



cleaning of, 126. 



Silvering, dead, upon Medals, 125. 

 Ships, sheathing of, how destroyed, 101. 



