38 DR. FARADAY’S EXPERIMENTAL RESEARCHES IN ELECTRICITY. (SERIES XXVIII.) 
Hence the comparison of any one section of a given amount of lines of force with 
any other section is rendered, experimentally, very extensive. 
3111. Such results prove, that, under the circumstances, there is no loss, or de- 
struction, or evanescence, or latent state of the magnetic power by distance. 
3112. Also that convergence or divergence of the lines of force causes no differ- 
ence in their amount. 
3113. That obliquity of intersection causes no difference. It is easy so to shape 
the loop (3110.), that it shall intersect the lines of force directly across at both places 
of intersection, or directly at one and obliquely at the other, or obliquely in any de- 
gree at both ; and yet the result is always the same (3093.). 
3114. It is also evident, by the results of the rotation of the wire and magnet 
(3097. 3106.), that when a wire is moving amongst equal lines (or in a field of equal 
magnetic force), and with an uniform motion, then the current of electricity pro- 
duced is proportionate to the time ; and also to the velocity of motion. 
3115. They also prove, generally, that the quantity of electricity thrown into a 
current is directly as the amount of curves intersected. 
3116. In addition to these results, this method of investigation gives much insight 
into the internal condition of the magnet, and the manner in which the lines of force 
(which represent truly all that we are acquainted with of the peculiar action of the 
magnet) either terminate at its exterior, or at any assumed points, to be called poles ; 
or are continued and disposed of within. For this purpose, let us consider the ex- 
ternal loop (3093.) of fig. 5. When revolving with the magnet no current is pro- 
duced, because the lines of force which are intersected on the one part, are again 
intersected in an opposing direction on the other (3110.). But if one part of the 
loop be taken down the axis of the magnet, and the wire then pass out at the equator 
(3091.), still the same absence of effect is produced; and yet it is evident that, ex- 
ternal to the magnet, every part of the wire passes through lines of force, which con- 
spire together to produce a current ; for all the external lines of force are then inter- 
sected by that wire in one revolution (3101.). We must therefore look to the part 
of the wire within the magnet, for a power equal to that capable of being exerted ex- 
ternally, and we find it in that small portion which represents a radius at the cen- 
tral and equatorial parts. When, in fact, the axial part of the wire was rotated it 
produced no effect (3095.) ; when the axial, the inner radial, and the external parts 
were revolved together, they produced no effect ; when the external wire alone was 
revolved, directly, it produced a current (3091.) ; and when the internal radius wire 
alone (being insulated from the magnet) revolved, directly, it also produced a current 
(3095.3098.) in the contrary direction to the former; and the two were exactly 
equal in power ; for when both portions of the wire moved together directly, they 
perfectly compensated each other (3095.). This radius wire may be replaced by the 
magnet itself (3096. 3118.). 
