326 =H. A. Rowland—Studies on Magnetic Distribution. 
conducted electricity or heat, it now being well established from 
the researches of Professor Maxwell and others that this 
method gives exactly the same results as the other method of 
considering the action to take place at a distance. : 
In arranging this paper I have thought best to give the 
theory of the distribution first, and then afterward to see how 
exact; so that although they are only approximate, yet We 
know just where they should differ from experiment. 
Il. 
If we take an iron bar and magnetize one end of it either by 
a magnet or helix, we cause lines of magnetic induction” % 
enter that end of the bar, and after passing down it to a certain 
distance to pass out into the air and so around to the bar agale 
to complete their circuit. At every part of their circuit they 
encounter some resistance, and always tend to pass 10 tha 
direction where it is the least; throughout their whole course 
they obey a law similar to Ohm’s law, and the number of lines 
passing in any direction between two points is equal to the dif 
# For difference Velwceon & nee . magnetic induction 
See Maxwell’s “ Treatise cu Mecetno cen Anatolien* orta 406; 592, and 604. 
. 
