ee 
%. 
Dr. Faraday on Magnetic and Diamagnetic Action. 237 
to submit them to ae eaperiinens, T —_ to keen to the 
ve ociety. © 
* 2429. Theoretically, an Suilanation of the movements of the 
diamagnetic bodies, and all the dynamic phenomena consequent 
Upon the action of magnets on them, might be offered in the 
_ Supposition that magnetic induction caused in them a contrary 
state to that which it produced in magnetic matter ; 7. e. that if a 
oe of each kind of matter were placed in a magnetic field 
both would become magnetic, and each would have its axis paral- 
Jel to the resultant of magnetic force passing through it; but the 
particle of magnetic matter would have its north and doit poles 
Opposite, or facing towards the contrary poles of the inducing 
magnet, whereas with the diamagnetic particles the reversé would 
be the case; and hence would result approximation in the one 
autour, recession in the other. 
: Upon Ampézre’s theory, this view would be equivalent 
to the: supposition, that as currents are induced in iron and mag- 
- Retics parallel to those existing in the inducing magnet or battery 
_ Wire ; so in bismuth, heavy glass, and diamagnetic bodies, the 
* Gatrents induced are in the contrary direction. This would make 
. the currents in diamagneties the same in direction as those which 
are induced in diamagnetic conductors at the commencement of 
the inducing current ; and those in magnetic bodies the same as 
those “produced at thie? cessation of the same inducing current. 
No difficulty would occur as respects non-conducting magnetic 
and diamagnetic substances, because the hypothetical currents 
to exist not in — — but round the Te of 
the ‘matter 
2431, As far as axprinnenit yet bears — stich ‘a notion, we 
may observe, that the known indtictive effects upon masses of 
Magnetic and diamagnetic metals are the same. If a straight rod 
of i iron be carried across magnetic lines of force, or if it, or a he- 
of tron rods or. Wire, be held near a magnet, as the power in 
‘it tises electric currents are induced, which move through the 
or helix in certain determinate directions. If a bar or a he- 
lix of bismuth be employed under the same circumstances, the 
currents aré again induced, and precisely m the same direction as 
in the j iron, so that here no difference occurs in the direction of 
the induced current, and not very much in its force, nothing hke 
_ 80 much indeed as. between the current induiced in either of these 
_ Szconp a Vol. II, No. 5.—Sept., 1846. - a 
