It will be plain to all that we might make the electromagnet stationary and revolve the permanent magnet and get the same result.
It is not necessary that the magnetic field be created by a permanent magnet.
In this figure a harp of steel rods is employed, attached to the poles of a permanent magnet, N. S.
In the magnetic field of the permanent magnet was an electro-magnet.
This alternating current flows around the coils on the poles of the permanent magnet.
The ordinary, permanent magnet, natural or artificial, has little place in the arts.
The armature is in contact with one pole of the permanent magnet and nearly in contact with the other.
All the markings of Fig. 21 relate to the polarity produced by the permanent magnet.
Pass the coil back and forth close to the end of a permanent magnet.
Rotary motion with a hollow coil of wire and a permanent magnet.