238 POPULAR LECTURES AND ADDRESSES. 



at the surface of the water, when finally adjusted, 

 ought to be nicely rounded. After completing 

 this adjustment, which may require a little patience, 

 pull the needle out from the wooden stem, and 



FIG. 32. 



steady it upon a table by aid of two fingers. 

 Draw one end of the bar magnet once along it 

 steadily from eye to point. Replace the needle 

 in its proper position on the wooden stem and 

 float it. It will then be seen to turn into a position 



