T H E 

 LONDON, EDINBURGH and DUBLIN 



PHILOSOPHICAL MAGAZINE 

 JOURNAL OF SCIENCE. 



[THIRD SERIES.] 



DECEMBER 1847. 



LXIV. On the Diamagnetic conditions of Flame and Gases. 

 By Michael Faraday, F.R.S., Foreign Associate of the 

 Academy of Sciences, Sec, 



To Richard Taylor, Esq. 



Royal Institution, 



My dear Sir, Nov. 8, 1847. 



I LATELY received a paper from Professor Zantedeschi, 

 published by him, and containing an accomit of the dis- 

 covery, by P. Bancalari, of the magnetism (diamagnetism) of 

 flame, and of the further experiments of Zantedeschi, by which 

 he confirms the result, and shows that flame is repelled from 

 the axial line joining two magnetic poles. I send you the 

 paper that you may, if you estimate its importance as highly 

 as I do, reprint it in the Philosophical Magazine ; and I send 

 also with it these further experimental confirmations and ex- 

 tensions of my own. As M. Zantedeschi has published his 

 results, I have felt myself at liberty to work on the subject, 

 which of course interested me very closely. Probably what I 

 may describe will only come in confirmation of that which has 

 been done already in Italy or elsewhere ; and if so, I hope to 

 stand excused ; for a second witness to an important fact is by 

 no means superfluous, and may in the present case help to 

 induce others to enter actively into the new line of investigation 

 presented by diamagnetic bodies generally. 



I soon verified the chief result of the diamagnetic affection 

 of flame, and scarcely know how I could have failed to observe 

 the effect years ago. As I suppose I have obtained much 

 more striking evidence than that referred to in Zantedeschi's 

 paper, I will describe the shape and arrangement of the essen- 

 tial parts of my apparatus. The electro-magnet used was the 

 powerful one described in the Experimental Researches 

 (2247 *.). The two terminal pieces of iron forming the virtual 

 magnetic poles were each r7 inch square and six inches long; 

 • Page 398 of this Journal for May 1846. 



Phil. Mag. S. 3. Vol. 31 . No. 210. Dec. 1847. 2 D 



