examine it in a similar way, you see that one of its ends repels the suspended magnet; the force
Fig. 37.
|
Fig. 38.
|
then is no longer attraction but repulsion; but, if I take the other end of the magnet and bring it near, it shows attraction again.
You will see this better, perhaps, by another kind of experiment. Here (fig. 38) is a little magnet, and I have coloured the ends differently so that you may distinguish one from the other. Now this end (s) of the magnet (fig. 37) attracts the uncoloured of the little magnet. You see it pulls it towards it with great power. And as I carry it round, the uncoloured end still follows. But now if I gradually bring the middle of the bar magnet opposite the uncoloured end of the needle, it has no effect upon it, either of attraction or repulsion, until, as I come to the oppo-
