﻿MAGNETISM. 



23 



about Magnetism. 1 want you to put your shillings and sixpences 

 together, and go or send to Mr. Joseph M. Wightman's, No. 33 



Cornhill, Boston, for a Horse-shoe Magnet, as it is called, and a Mag- 



netic Needle, mounted on a stand. The magnet will cost fifty cents, 

 the needle one dollar. Having received the articles, invite in your 

 schoolmates and we will see what can be done. I put the needle on 

 to the brass stand. It turns its north pole to the North Star. Here 

 you can see how ships are steered across the ocean into any desired 

 port with such accuracy. The needle, however, does not point 

 exactly north in all places. In Baffin's Bay it is said to point almost 



