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ago I had tried Tome Experiments to this Purpofe, by 
placing fome Bars parallel and in Contact, but fo 
that their Poles were turned different ways: in 
which Pofition I found the Virtue of fome of them 
remain'd pretty entire, but that others were weakened 
thereby. I imagin'd the Reafon of their lofing their 
Force was this s that the magnetic Virtue was by 
degrees habituated to pafs out of the Side of one 
Bar into that of the other in Contad with it, and 
thereby was hinder'd from arriving at the Ends in its 
full Vigour. The Reafon why fome fuffer'd more than 
others was doubtlefs to be afcrib'd to their Differ- 
ence in Temper. I repeated the Experiment about 
two Months ago, with a little Alteration. I placed 
the Bars parallel with their Poles in an alternate Po- 
rtion, as before, but not in Contad, having kept 
them at the Diftance of about a Quarter of an Inch. 
Then I apply’d to their Ends two Pieces of foft Iron. 
Each Piece was laid acrofs from the North End of 
one Bar to the South of the other, in the fame 
manner as the Lifter is applied to the Feet of an 
armed Loadftone. The Intent of this was to draw 
the magnetic Virtue thereby down to the Ends of 
the Bars, and to convey it through the Pieces of 
Iron from one to the other. In this Condition I let 
them lie for about a Month, and then tried if they 
would lift the fame Weight as before, which I found 
they did, and I thought with more Vigour. After 
this I repeated the Experiment with other Bars of 
various Sizes, and with the fame Succefs : I have 
therefore now ventur’d to fit them up in Cafes in 
the manner juft defcribed. 
Rr r r 
The 
