THE 

 LONDON, EDINBURGH, and DUBLIN 



PHILOSOPHICAL MAGAZINE 



AND 



JOURNAL OF SCIENCE. 



♦ 



[FOURTH SERIES.] 



OCTOBER 1875. 



XXIX. Studies on Magnetic Distribution. By Henry A. Row- 

 land, of the Johns Hopkins University , Baltimore ,Md., U.S.A.* 



Part I. — Linear Distribution. 



Contents. 



I. Preliminary remarks. 

 II. Mathematical theory. 



III. Experimental methods for measuring linear distribution. 



IV. Iron rods magnetized by induction. 



V. Straight electromagnets and permanent steel magnets. 

 VI. Miscellaneous applications. 



IN a paper of mine published about two years ago, I alluded 

 to some investigations which I had made in 1870 and 1871 

 on the distribution of magnetism. It is with diffidence that I 

 approach this subject, being aware of the great mathematical 

 difficulties with which it is surrounded. But as the facts are 

 still in advance of what is known on the subject, and as I see 

 that other investigators t are following hard upon my footsteps, 

 I thought it would be well to publish them, particularly as it is 

 no fault of mine that they did not appear some years ago J. The 

 mathematical theory which I give, although not particularly 

 elegant, will at least be found to present the matter in a new 

 and more simple light, and may be considered simply as a deve- 



* Communicated by the Author. 

 f Particularly M. Jamin. 



X All the experiments referred to in this paper were made in the winter 

 of 18/0-71. 



Phil. Mag. S. 4. Vol. 50. No. 331. Oct. 1875. S 



