. tad 
* 2519.). Both it and bismuth can be made to nee evide e ms ae 
» the induced currents “produced in them when the used ‘ir # 
ith 
in er 
' ® quarter ofan. in 
oe sind whilst at an ah 
fi * 
oy 
Pi a 
: ‘ 
ai es 
‘. r ee 
Supposed Polarity of Diamagnetic Bodies. 201 
of the deadening effect of the copper plate beneath it, and, ex- 
cept to return to zero, moves very little after the motion of the 
apparatus ceases. A silver core produced the same results. 
2684. These effects of induced currents have, a relation to the 
( Pp 
trate each other. That the revulsive phenomena are a d 
by induced currents, has been shown before (2327. 2329. 2336. 
2339.) ; the only difference i is, that with them the induced cur- 
rents were produced by exalting the force of a magnet placed at 
a fixed distance from the affected metal; whilst in the present * * 
phenomena, the force of the eee does not change, but its dis- 
tance from the piece of metal doe 
2685. So also the same oitenmatagiie which — the eee 
course of the induced currents it is not then affected (252 e 
ring helix of copper wire, if the extremities be unconn fe : 
not exhibit the Foto but if they be connested then it pi nie es 
sents them (26 
2686. On —— the revulsive phenomena are a a be bett Se 
test and indication of these currents than the present ene <o 
pecially if advantage be taken of the edie of the m 
plates, so as to be a eae or rather superior, in res *g 
the disc cylinder cores (2659. 2661.). Platinum, palladium and. 
lead in leaf or foil, if cut or folded into squares half an inch 3 in“ 
the side, and then packed regularly together, will show, een 
nomena of revulsion very well; and that according to tk 
tion of the leaves, and not of the external form. - o i 
tin and copper have the revulsive effect coli thus Pak y exa ed : 
Antimony, as I have already shown, exhibits the e ; 
e or associated, althoughs,to a% vid 
ic force, a little me : 
id breaki ac 
thin plates, e 
ed by Heat, afid then 
afMiuch in me side 1, 
enty-two pacer the se 
ore (2248.),0 +, 
in! ng se we 3 
d by a silk film as’ 
gle of N° or thereabouts with ves equatorial $° 
line (2252.), the electromaghet’ was aes 45> ot it immediately ad~ 
about. 
tie or ae asl the arigle-was or 50°, and 
No. 29.—Sept, 1850. 
metal. ‘This bitck. vas » 
