ELECTROTYPE APPARATUS AND MATERIALS. 



SUver Solution, for Electroplating (Cyanide of Silver and Potassium), per 

 ounce, 2s. 



%* Two ounces of this solution, diluted with 18 fluid ounces of water, 

 form a pint of solution containing one ounce of silver per gallon. 

 See page 105. 



Cyanide of Potassium, fused, 6s. per Ib. ; Gd. per ounce. 



Yellow Prussiate of Potash, crystallized, per Ib. 2s. Gd. ; per ounce, 3d. 



Hyposulphite of Soda, crystallized, per Ib. 3s. 



Sulphite of Soda, crystallized, per ounce, 6d. 



Platinum, in wire and foil, per grain, Id. 



Platinum, Bi-chloride, in solution, per ounce, 5s. 



Cyanide of Platinum. Cyanide of Palladium. 



Cyanide of Nickel, in solution, per ounce, 



Sulphate of Copper, crystallized, Commercial, per Ib. Gd. 



" n Pure, per ounce, 2d. 



Sulphate of Zinc, crystallized, per Ib. Is. 3d. 

 Nitric Acid, Commercial, per Ib. lOd. ; Pure, per Ib. Is. Gd. 

 Muriatic Acid, n 3d.; n 9rf. 



Sulphuric Acid, n n 3d. ; n Is. Gd. 



MATERIALS for MAKING MOULDS, and 

 Preparing them to receive Deposits. 



Plaster of Paris, 4 Ib. in a sealed bottle, Is. 



Gutta Percha, best quality, for Cells or Moulds, in sheets, % inch or inch 



thick, per Ib. 3s. 

 White Wax, per Ib. 3s. 

 Prepared Stearine, per Ib. Is. Gd. 



Gutta Percha Cells for Batteries, made to any required size. 

 Flake White, per ounce, 2rf. 

 Solution of Phosphorus in Bisulphuret of Carbon, one ounce, in stoppered 



bottle, Is. 



Bisulphuret of Carbon, per Ib. 3s. Gd. ; per ounce, 4J. 

 Phosphorus, per ounce, Sd. 

 Pure Plumbago (Black-lead), for giving a conducting coating to Casts and 



Moulds, per bottle, Gd. 

 Brush for applying Plumbago to Moulds, Gd. 

 Fusible Alloy, for Metallic Moulds, per Ib. 3s. Gd. 

 A variety of Gutta Percha Moulds of Medals, prepared for receiving Deposits, 



at 6cf., 9c, Is., Is. 3d, and Is. Gd. each. 



