HOW IRON TOUCHED BY A LODESTONE TURNS TOWARDS THE POLES OF THE WORLD
It is well known to all who have made the experiment, that when an
elongated piece of iron has touched a lodestone and is then fastened to
a light block of wood or to a straw and made float on water, one end
will turn to the star which has been called the Sailor’s star because it
is near the pole; the truth is, however, that it does not point to the
star but to the pole itself. A proof of this will be furnished in a
following chapter. The other end of the iron will point in an opposite
direction. But as to which end of the iron will turn towards the north
and which to the south, you will observe that that part of the iron
which has touched the south pole of the lodestone will point to the
north and conversely, that part which had been in contact with the north
pole will turn to the south. Though this appears marvelous to the
uninitiated, yet it is known with certainty to those who have tried the
experiment.