45, CORffHILL, B.C., AND 122, REGENT STREET, W., LONDON". 431 



FIG. 2537. 



FIG. 2535. 



Each. 

 a. d. 



2535 Grove's Battery, single cell (fig. 2535) . -. . . . . 10 



2536 Set of Four Grove's Batteries, with suitable metallic connections, porous 



cells, and earthenware troughs, in mahogany tray . . . 2 10 



2537 Set of Five Grove's Batteries, in tray (fig. 2537) . . . .330 



2538 Set of Eight ditto, in mahogany tray . . . ^. .550 



2539 Set of Ten ditto, in ditto 660 



2540 Grove's Gas Battery, in which the active elements are Hydrogen and Oxygen 



gases ; set of six gas batteries mounted on a stand . . 6 10 



2541 Water Battery, Crosse's, a Voltaic Combination of high intensity. 



Fitted up to order with any number of pairs of metallic elements, placed in glass or porcelain 

 cells, from 200 to 2000. The apparatus is constructed with due regard to insulation, and, by means of 

 binding-screws, the action of any number in the series may be examined with great convenience, and any 

 cells removed without disturbing others. 



2542 Bunsen's Carbon Battery (elements Zinc and Carbon) single cell, shown in 



section fig. 2542 10 6 



2543 Bunsen's Batteries, a series of ten, arranged in a stout wood tray (fig. 2543) 



550 



The Carbon Batteries are excited by the same acids as Grove's arrangement (strong nitric acid and 

 dilute sulphuric acid, 1 part strong acid to 7 or 8 of water), and will be found next to it in intensity and 

 energy, at a much lower original cost. 



FIG, 2543. 



FiG. 2542. 



