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Breadth of an Inch, and ™ in Thicknefs : Its 
Weight was 3 Drams and 10 Grains. In this Stone I 
placed the magnetical Virtue, in fuch a Manner that the 
two oppofite Ends became, both of them, South 
Poles j and the Middle was, quite round, a North 
Pole. 
2. Another Stone was in Length 1 Inch T o, in 
Breadth ,~J, and in Thicknefs about fo at a Medium , 
it being thicker at one End than at the other : I:s 
Weight 1 Dram 57 Grains. The 2 oppofite Ends 
of this Stone I made both North Poles, and the 2 
oppofite Sides South Poles. 
3.. An irregular Stone, that weigh’d about 5 
Ounces and a half, had 2 broad flat Surfaces oppofite 
to each other, at the Diftance of 1 Inch and -77. I 
made half of each of thefe Surfaces a North Pole, 
and the other half a South Pole; fo that the North 
Pole of one Surface was oppofite to the South Pole 
of the other Surface, and vice verfa . 
4. I took a Stone of a pretty good Kind, that had 
a Grain very apparent, running the lengthways of 
it : It was 1 Inch ~ in Length, 1 Inch ~ in Breadth, 
and its Thicknefs at the Sides was 7-3- of an Inch,- but 
in the Middle it being tapered away from the 
Middle to the Sides: Its Weight was 3 Ounceswant- 
ing 4 Grains. At one End of it I placed a North 
Pole furrounded by a South ; and at the other End 
a South furrounded by a North Pole ; fo that the Edges 
of each Surface had a Pole of a different Denomina- 
tion from that which occupied the Middle. 
A great many Varieties of this kind might be eafily 
devifed ; but thefe Examples feem fufficient to £hew 
how 
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