34 DR. FARADAY’S EXPERIMENTAL RESEARCHES IN ELECTRICITY. (SERIES XXVIII.) 
3098. Another arrangement of the magnet and wires was of the following kind. 
A radial insulated wire was fixed in the middle of the magnets, from the centre 
d, fig. 9, to the circumference h, being connected there with 
the equatorial ring (3097.) ; an axial wire touched this 
radial wire at the centre and passed out at the pole ; the 
external part of the circuit, pressing on the ring at the 
equator, proceeded on the outside over the pole to form 
the communication as before. In the case where the magnet was revolved without 
the axial and the external wire, the full and proper current was produced ; the small 
wire, d h, being, however, the only part in which this current could be generated by 
the motion ; for it replaced, under these circumstances, the body of the magnet em- 
ployed on the former occasion (3097.)* 
3099. The external part of the wire, instead of being carried back over that pole 
of the magnet at which the axial wire entered, was continued away over the other 
pole, and so round by a long circuit to the galvanometer; still the revolution of the 
magnet, under any of the described circumstances, produced exactly the same results 
as before. It will be evident by inspection of fig. 10, that, however the wires are 
carried away, the general result will, according to the 
assumed principles of action, be the same ; for if a be the 
axial wire, and h', h", b'" the equatorial wire, represented in 
three different positions, whatever magnetic lines of force 
pass across the latter wire in one position, will also pass 
across it in the other, or in any other position which can be 
given to it. The distance of the wire at the place of inter- 
section with the lines of force, has been shown, by the ex- 
periments (3093.), to be unimportant. 
3100. Whilst considering the condition of the forces of a magnet, it may be ad- 
mitted, that the two magnets used in the experimental investigations described, act 
truly as one central magnet. We have only to conceive smaller similar magnets to 
be introduced to fill up the narrow space not occupied by the wire, and then the 
complete magnet would be realized : — or it may be viewed as a magnet once perfect, 
which has had certain parts removed ; and we know that neither of these changes 
would disturb the general disposition of the forces. In and around the bar magnet 
the forces are distributed in the simplest and most regular manner. Supposing the 
bar removed from other magnetic influences, then its power must be considered as 
extending to any distance, according to the recognized law ; but, adopting the 
representative idea of lines offeree (3074.), any wire or line proceeding from a point 
in the magnetic equator of the bar, over one of the poles, so as to pass through the 
magnetic axis, and so on to a point on the opposite side of the magnetic equator, 
must intersect all the lines in the plane through which it passes, whether its course 
be over the one pole or the other. So also a wire proceeding from the end of the 
magnet at the magnetic axis, to a point at the magnetic equator, must intersect 
Fig. 10. 
