522 



The Rev. T. E. Robinson's Experimental Researches on the 



no difference ; their action must tend to make it negative, and therefore the 

 change may be referred to a diminution of coercive force, which permits a 

 greater development of magnetism. The correction is, therefore, the difference 

 of two opposite actions. The formula gives L a maximum at 199°"7, and, if it 

 could be depended on so far beyond the observations on which it rests, indi- 

 cates that the correction would become negative at 468. 



The following are the results by varying ^, the negative sign before it de- 

 noting that the current is reversed ; and that before L, that the polarity is 

 changed : — 



Table XXXII. 



