THE GALVANOMETER. 



747 



ducting wire is repeatedly carried first between the 

 two needles and then back again beneath the lower 

 needle, so that the deflecting action of the same current 

 upon the needles is multiplied many times. An instru- 

 ment of this kind is called a Multiplier or c Galvanometer.' 

 A very simple multiplier with 10 coils of stout covered 

 copper wire is represented in fig. 377. It may be 



FIG. 377 ((in. proj. ; real size}. 



easily constructed, and will distinctly show the current 

 produced by one cell of the small battery, fig. 336. 



The arrangement of the parts of this apparatus and its construe- 



