NOMOS. 



75 



be, if we may use the word, subtensial ; that is, in the 

 line a c. 



Fig. 20. 



And this must always be the direction of motion. 

 The amount of motion must vary in proportion to 

 the degree in which the attraction acting upon the 

 magnet is intensified on the one hand and neutral- 

 ized on the other hand, the amount being always 

 directly proportionate to the degree ; but the direc- 

 tion of motion must always be subtensial, when it is 

 considered in relation to the imaginary circle which 

 passes through the magnet and around the conductor 

 as a centre. 



Now it is not altogether a matter of indifference 

 whether the direction of motion in this case is tan- 

 gential or subtensial. If it is at right angles to the 

 line connecting the magnet and conductor, the magnet 

 could not move in a circle, except it were bound 

 down by something which should discharge the office 



