THE 



PHILOSOPHICAL MAGAZINE 



AND 



ANNALS OF PHILOSOPHY. 



[NEW SERIES.] 



JUNE 1832. 



LV. On the Electro-motive Force of Magnetism. By Signori 

 NoBiLi and Antinori; [from the Antologia, No. 131) : 

 isith Notes by Michael Faraday, Esq., F.R.S.y M.R.I. 

 Corr. Memb. Roy. Acad. Scien. of Paris, SfC* 



IV/rR. FARADAY has recently discovered a new class of 

 "'■-*• electro-dynamic phaenomena. He has presented a me- 

 moir on this subject to the Royal Society of London, which is 

 not yet published, and of which we have received the simple 

 notice, communicated by M. Hachette to the Academy of 

 Sciences at Paris on the 26th of December last, in consequence 

 of a letter which he had I'eceived from Mr. Faraday himself +. 

 This relation induced Cav. Antinori and myself immediately 

 to repeat the fundamental experiment, and to study it under 

 its various aspects. As we flatter ourselves we have arrived at 

 results of some importance, we hasten to publish them without 



* Communicated by Mr. Faraday. 



[t I am glad of an opportunity of adding a few notes to a public version 

 of Sig. Nobili and Antinori's paper. My hasty letter to M. Hachette, in 

 consequence, probably, of my bad writing, has been translated with some 

 errors; and has been, by Sig. Nobili at least, seriously misunderstood. Had 

 it remained private, it would not have been of much consequence : but as it 

 has appeared in three or four languages, and forms the text of all subsequent 

 papers on magnetic electricity, it is very requisite to correct certain errors 

 which have arisen from it, especially that of Sig. Nobili relative to Arago's 

 rotation. 



My first paper was read to the Royal Society, November 24, 1831 ; and 

 my letter to M. Hachette was dated the 17th of December 1831; my 

 second paper was read January 12th, 1832. Sig. Nobili's paper is dated 

 January 31st, 1832. Sig. Nobili and Antinori worked only from the letter 

 to M. Hachette; but as I hope I may claim whatever is contained in my 

 two papers, I have introduced into the present paper references, in figures 

 included within parentheses, to paragraphs in my papers, wherever the ex- 

 periments described are either altogether, or only to a partial extent, repe- 

 titions of my results. — M. F. ] 



N.S. Vol. Jl. No. G6. Jmc 1832. 3 F any 



