MAGNETIC EXl’EKIME NTS 59 
made from end to end of the bar, on each side of 
it, the north and south poles of the magnet being 
always directed to the south and north poles of 
the bar respectively, the magnet was slipped side¬ 
ways off, when at the pole of the bar, and the bar 
was found to have acquired such a magnetic power 
as to enable it to sustain a weight of several 
ounces, hung from the conductor. All the bars 
of the horse-shoe magnet were treated this way 
in succession. The first five bars of the mao-- 
o 
net, being then combined by the screws, were 
employed in the same way as the soft steel mag¬ 
net had been used, for increasing the power of the 
sixth and seventh bars, by which they were render¬ 
ed capable of carrying above two pounds weight 
each. These were then substituted, in the com¬ 
bined magnet, for the fourth and fifth bars, while 
the latter underwent the touch of the other five 
in combination; and, in their turn, the second and 
third, and then the seventh and first, were subject¬ 
ed to a similar treatment. After these operations, 
which occupied forty-three minutes, the compound 
magnet, with all the seven bars in connection, 
lifted ten pounds. After a second series of the 
same kind of manipulations, five of the bars in 
combination, carried fifteen pounds ; and, after a 
third series, eighteen pounds : but as, on trying 
a fifth series, little augmentation took place, the 
