330 SEC. 10. ELECTRICITY. 



c, d, and/. Copper deposits of the two sides of the nozzle of the candlestick^ 



and the base removed from the moulds. 

 g. The same soldered together and fitted. 

 h. The candlestick silvered and completed. 



173Oa. Reproduction of the " Strauss " Tankard. 



South Kensington Museum. 



a. A copy or reproduction complete with fictile ivory body or drum. 



b. Mould of the " drum." % 



c. Cast in fictile ivory. 



d. Moulds with the copper deposited in them. 



e. Copper deposits removed. 



f. The same soldered together to form a metal " drum." 



f. Moulds of the handle. 

 . Moulds with the copper deposited in them. 

 i. Copper deposits removed from the moulds. 

 j. The same soldered together as part of the tankard. 

 k. A group of the other details of the tankard deposited in copper and 



removed from the moulds. 

 /. The tankard as soldered together and fitted with copper "drum," ready 



for gilding, &c. 

 m. Completed metal copy of the tankard, silvered and parcel gilt. 



173Ob. A Group of Ferns, &c., in a basket, as an illustra- 

 tion of the method of coating natural objects, however delicate, 

 with copper, and afterwards silvering or gilding the same. 



The objects are first prepared with a metallic surface, then immersed in a 

 solution of sulphate of copper, and afterwards electro-plated with gold or 

 silver. 



1730c. Electro Jewellery, Gustave Trouve, Paris. 



1731. Batteries used in the Electrotype process. 



J. Hoio and Co. 



Single-cell battery consists of a glass outer cell furnished with a perforated 

 shelf, with an upright porous vessel containing a zinc rod well amalgamated. 

 The porous cell is charged with dilute sulphuric acid, and the object to be coated 

 attached to the binding screw by a copper wire, and suspended in the outer 

 glass vessel, which is filled with a 1 saturated solution of sulphate of copper, a 

 supply of crystals of this sulphate being placed upon the perforated shelf for 

 the purpose of keeping up the strength of the solution. 



Smee's battery consists of a central platinised silver plate for the negative 

 element between two zinc plates, connected together by a clamp. It is 

 charged with dilute sulphuric acid. 



1731a. Dani ell's Constant Battery. J. How and Co. 



The outer copper cell forming the negative element ; the positive element 

 consists of a rod of zinc placed in a porous cylinder. To charge the battery 

 the porous cell is filled with dilute sulphuric acid and the outer cell with a 

 saturated solution of sulphate of copper, crystals of the sulphate being placed 



