The Magnetic Wand
Bore a hole three-tenths of an inch in diameter, through a round stick
of wood; or get a hollow cane about eight inches long, and half an
inch thick. Provide a small steel rod, and let it be very strongly
impregnated with a good magnet: this rod is to be put in the hole you
have bored through the wand, and closed at each end by two small ends
of ivory that screw on, different in their shapes, that you may better
uish the poles of the magnetic bar.
When you present the north pole of this wand to the south[E] pole of a
magnetic needle, suspended on a pivot, or to a light body swimming on
the surface of the water, (in which you have placed a magnetic bar,)
that body will approach the wand, and present that end which contains
the south end of the bar: but if you present the north or south end of
the wand to the north or south end of the needle, it will recede from
[E] For the more clearly explaining this, it is to be
observed, that the two ends of a magnet are called its poles.
When placed on a pivot, in just equilibrium, that end which
turns to the north is called the north pole, and the other
end the south pole.