460 Dr. Faraday's Researches in Electricity. 



no particular result; but when the magnetism was on. such an 

 operation cleared the powder from every point which came 

 over the cone, so that a mark was traced or written out in 

 clear lines running through the powder, and showing every 

 place where the pole had passed. 



2306. The bar of bismuth and a bar of antimony was found 

 to set equatorially between the poles of the ordinary horse- 

 shoe magnet. 



2307. The following list may serve to give an idea of the 

 apparent order of some metals, as regards their power of pro- 

 ducing these new effects, but I cannot be sure that they are 

 perfectly free from the magnetic metals. In addition to that, 

 there are certain other effects produced by the action of mag- 

 netism on metals (2309.) which greatly interfere with the re- 

 sults due to the present property. 



Bismuth. Cadmium. 



Antimony. Mercury. 



Zinc. Silver. 



Tin. Copper. 



2308. I have a vague impression that the repulsion of bis- 

 muth by a magnet has been observed and published several 

 years ago. If so, it will appear that what must then have 

 been considered as a peculiar and isolated effect, was the con- 

 sequence of a general property, which is now shown to belong 

 to all matter*. 



2309. I now turn to the consideration of some peculiar 

 phaenomena which are presented by copper and several of the 

 metals when they are subjected to the action of magnetic 

 forces, and which so tend to mask effects of the kind already 

 described, that if not known to the inquirer they would lead to 

 much confusion and doubt. These I will first describe as to 

 their appearances, and then proceed to consider their origin. 



2310. If instead of a bar of bismuth (2296.) a bar of copper 

 of the same size be suspended between the poles (2247.), and 



* M. de la Rive has this day referred me to the Bibliotheqite Umversclle 

 for 1829, tome xl. p. 82, where it will be found that the experiment spoken 

 of above is due to M. la Baillif of Paris. M. la Baillif showed sixteen years 

 ago that both bismuth and antimony repelled the magnetic needle. It is 

 astonishing that such an experiment has remained so long without further 

 results. I rejoice that I am able to insert this reference before the present 

 series of these researches goes to press. Those who read my papers will 

 see here, as on many other occasions, the results of a memory which be- 

 comes continually weaker; I only hope that they will be excused, and that 

 omissions and errors of that nature will be considered as involuntary. — 

 M. F. December 30, 1845. 



