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The Succefs of this Experiment had led me to 
another Improvement: I provided a Cafe of Brafs 
that would juft contain two Bars, fuch as are fold for 
half a Guinea. At one End of the Cafe were fixed 
two Feet of foft Iron, like thofe of an armed Load- 
ftone, the upper Surface of which was within the 
Cafe in Contad with the Ends of the two Bars : 
which being parallel to each other, and their Poles 
in an alternate Pofltion, the North End of one Bar 
will be in Contact with one of the Feet, and the South 
" End of the other Bar will be in like manner apply'd 
to the Surface of the other Foot. Upon fitting a 
Lifter to this new kind of Armour, I found I was 
able to fupport a Weight of about 6 Pounds : The 
Bars are kept afunder at the Diftance of about a 
Quarter of an Inch, by a Slip of Wood, which Hides 
in betwixt them. 
An Inftrument thus conftruftcd feems capable of 
anfwering all the Furpofes for which Loadftones are 
ufed 5 for when the Bars are taken out of the Cafe, 
they are fit for touching Needles, or other magneti- 
cal Ufes, which may require fingie Bars 5 when in 
the Cafe, the Whole together becomes an armed 
Magnet, able to lift a confiderable Weight And 
if we want to feparate iron Filings from thofe of 
other Metals, the Feet and all the lower Part of the 
Cafe will take them up in great Plenty, and by 
drawing the Bars a little way out of the Cafe the 
Filings will fall off. 
Some 
