GALYAXISM. 31)1 



of copper to the ends of two pieces of wire, as 

 Fig. 10, (annealed copper wire is the best) insert 

 them into the fluid in each of the extreme cells, as 

 in Fig. 9. Upon the other ends of the wires, slip 

 on a bit of small glass tube to lay hold of the wires 

 by. After a few minutes the acid will act upon 

 the plates ; and if the points of the wires be brought 

 near to each other by moving them by the glass 

 tubes, a spark will be perceived between them. 

 Some of the inflammable substance intended to be 

 acted upon may be laid upon a plate of glass, or 

 put between the points of the wires. In this man- 

 ner the combustion of gold and silver leaf, &c. may 

 be shown, forming some of the most beautiful ex- 

 periments. Copper or brass leaf, commonly called 

 Dutch gold, burns with a beautiful green light ; 

 silver, with pale blue light; gold, with yellow light; 

 and all, with a crackling something analogous to 

 the noise heard in the burning of paper rubbed 

 over with wet gunpowder. 



When very great power is wanted, several of 

 these batteries may be united, by placing them to- 

 gether, as in Plate 21. fig. 11. Pieces of copper 

 are cut into the form shown by Fig. 12., and bent 

 as in Fig. 13. : the bent ends of these pieces being 

 inserted into the adjoining cells, at the extremities 

 of each battery, a communication is formed from 

 the end A of the first battery, to the end B of the 

 last battery. If wires be now placed in these ends, 

 in the same manner as in the battery, Fig. 9., the 

 collected force of the whole will be exhibited at 

 the points of the wires. 



It is usual to make these batteries with 50 pairs 

 of metallic plates in each; so that four batteries 

 contain 200 pairs of plates, -which are sufficient to 



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