Page:Various Forces of Matter.djvu/129

Rh extremity  you see that it is the coloured end of the needle which is pulled towards it. We are now therefore dealing with two kinds of power, attracting different ends of the magnet—a double power, already existing in these bodies, which takes up the form of attraction and repulsion. And now when I put up this label with the word, you will understand that it is to express this double power.

Now with this loadstone you may make magnets artificially. Here is an artificial magnet (fig. 39) in which both ends have been brought

together in order to increase the attraction. This mass will lift that lump of iron, and what is more, by placing this keeper, as it is called,