456 Dr. Faraday's Researches in Electricity. [Series xx. 



I think, for the advantage of the inquiry, that I should con- 

 sider them in a section apart by themselves. Further, if any 

 other metals appeared to be magnetic, as these are, it would 

 be right and expedient to include them in the same class. 



2289. My first point, therefore, was to examine the metals 

 for any indication of ordinary magnetism. Such an examina- 

 tion cannot be carried on by magnets anything short in power 

 of those to be used in the i'urther investigation ; and in proof 

 of this point I found many specimens of the metals, which 

 appeared to be perfectly free from magnetism when in the 

 presence of a magnetic needle, or a strong horse-shoe magnet 

 (2157.), that yet gave abundant indications when suspended 

 near to one or both poles of the magnets described (2246.). 



2290 My test of magnetism was this. If a bar of the 

 metal to be examined, about two inches long, was suspended 

 (2249.) in the magnetic field, and being at first oblique to the 

 axial line, was upon the supervention of the magnetic forces 

 drawn into the axial position instead of being driven into the 

 equatorial line, or remaining in some oblique direction, then 

 I considered it magnetic. Or, if being near one magnetic 

 pole, it was attracted by the pole, instead of being repelled, 

 then I concluded it was magnetic. It is evident that the test 

 is not strict, because, as before pointed out (2285.), a body 

 may have a slight degree of magnetic force, and yet the power 

 of the new property be so great as to neutralize or surpass it. 

 In the first case, it might seem neither to have the one property 

 nor the other ; in the second case, it might appear free from 

 magnetism, and possessing the special property in a small 

 degree. 



2291. I obtained the following metals, so that when exa- 

 mined as above, they did not appear to be magnetic ; and in 

 fact if magnetic, were so to an amount so small as not to destroy 

 the results of the other force, or to stop the progress of the 

 inquiry. 



Antimony. 



Bismuth. 



Cadmium. 



Copper. 



Gold. 



Lead. 

 Mercury. 

 Silver. 

 Tin. 



Zinc. 



2292. The following metals were, and are as yet to me, 

 magnetic, and therefore companions of iron, nickel and co- 

 balt : — 



Platinum. I Titanium. 



Palladium. 



2293. Whether all these metals are magnetic, in conse- 

 quence of the presence of a little iron, nickel, or cobalt in them, 



