434 



NEailETTI AND ZAMBRA, 11OLBOEN VIADUCT, K.C., 



FIG. 2552. FIG. 2551. FIG. 2554. 



Fill the glass cell about ^ an inch high with powdered Sal Ammoniac ; 

 put the porous cell in its place, and half fill the glass cell with water (say 

 about 2 ounces of the crystal to 1 pint of water) pouring a little water into 

 the porous cell at the same time through the holes in the top. The solution 

 of Sal Ammoniac should always be strong, an excess of salt being kept in 

 the cell. 



The battery will remain in working order so long as the solution is 

 clear, and in contact with the zinc. When the solution comes turbid or 

 milky, add Sal Ammoniac, and in a few hours the battery will be as 

 powerful as ever. It may be placed aside for months without much 

 deteriorating, but if for a very long period it is best to remove to remove the 

 porous cell. Special care should be taken that the porous cell never stands 

 more than half its height in the liquid. 



Price for the Leclanche Battery Cells (fig. 2554) 



Each No. 1, 5s. 6d. ; No. 2, 4s. ; No. 3, 



Extra iLiincs for above . . . each . Is. 8 006 

 Chloro-hydrate of Ammonia in Powder . per Ib. 016 



2555 Insulated Stand, for exhibiting the combustion of Carbon, fusion 



of wire, &c., with the Galvanic Battery 150 



2556 Insulated Stand, with Henly's Universal Discharger and Press, 



two pairs of forceps, &c., applicable for both Yoltaic and 

 Frictional Electricity (see ante, page 417, fig. 2408) . . . 2 10 



Each. 

 s. d. 



036 



008 



Each. 

 s. d. 



FIG 25C3*. 



FIG. 2557. 



FIG. 2563. 



