428 



NEGBETTI AND ZAMBRA, HOLBORN VIADUCT, E.G., 



VOLTAIC ELECTRICITY. 



FIG. 2520. 



FIG. 2513. 



FIG. 2527. 



YOLTAIC OE GALVANIC APPAEATUS. 



2513 



2514 



2515 



2516 



2517 



2518 



2519 



2520 



Volta's Pile of 50 pair of Zinc and Copper Plates, 

 soldered together, on a mahogany stand (fig. 2513) . 



Zinc and Copper Plates, circular, soldered together 



per doz. 



Pairs of Silver and Zinc Wires, soldered together, for 

 Voltas Couronne de tasse .... per doz. 



Pair of Circular Zinc and Copper Plates, with Glass 

 handles, for showing the production of electricity by 

 contact. . . . ...... 



Zinc and Copper Sieves, with Glass Handle, to illustrate 

 the Electric Action produced by sifting metal filings 

 on a delicate Electrometer .... per pair 



Cruikshank's Batteries, Zinc and Copper, in mahogany 

 troughs, for Medical purposes, 25 pairs of plates, 



Ditto 60 pairs of plates, 2-inch (fig. 2519) 



Wollaston's or Babington's Battery of ten pairs of 



4-inch plates, Zinc and Copper, with divided trough 



(fig. 2520) ......... 



Each. 

 s. d. 



Each. 

 s. d. 



16 180 



050 



080 



12 6 



14 



220 



2521 Cruikshank's, Wollaston's, or Sturgeon's Batteries, are charged with dilute 

 Sulphuric acid in the proportion one part, by measure, strong acid, to fourteen parts 

 Water ; or, if very strong action be required for a short time the quantity of the 

 acid may be increased, say 1 to 10. Dr. Fyf e found the use of a solution of Sulphate 

 of Copper in these batteries increased their action. 



