THE MULTIPLIER OR GALVANOMETER. 



161 



trary to that of the attraction of the earth, and by 

 carefully bringing this magnet nearer until the action 

 of the earth is almost entirely cancelled. Or two mag- 



FIG. 37. A MULTIPLIER. 



netic needles, as similar as possible, are connected by a 

 fixed intermediate piece in such a way that the corre- 

 sponding poles are turned in opposite directions. As 

 the force of gravitation now tends to turn the two 



