[ > 6 + ] 
invert or change the Diredion of the Poles in natu- 
ral Loadfloncs. 
Such a Stone belonging to Mr. Francis Hauksbeey 
weighing about 5 Ounces and 14 Peny weights, of 
an irregular cylindrical Form, with 2 of the Sides 
fomewhat flatted, upon which Armour had formerly 
been applied, had the Direction of its Polarity from 
one of thefe flatted Sides to the other, notwithftand- 
ing the Stone had a diflind Grain running at right 
Angles to that DirefHon. It was tried and obferved, 
that one of thefe flatted Sides ftrongly attraded the 
North End, and repelled the South ; and that the 
other attracted the South, and repelled the North 
End of the magneticfNeedle. The End of the Stone, 
attradin° the South End of the Needle, was then 
marked, by the rubbing of a Piece of Silver upon it, 
as upon a Touchftone : After which, Mr. Knight 
carried the Stone into his Study : and, re producing 
it in about a Minute, fhew’d, that the Poles were 
then dircdly inverted ; and that the fame End, which 
before attraded the South End of the Needle, now 
attraded the North, and repelled the South, and 
vice •verfd. 
After this, Mr. Knight , again taking the Stone, 
brought it back in as fhort a time as before, with 
the Direction of its Polarity turned at right Angles to 
its former Diredion, and into the Direction of the na- 
tural Grain of the Stone, the Poles now lying in the flat 
EndsoftheCylinder; one of which, bemgthe fmoothcr 
End, attraded the South End of the Needle, whilft 
the other, which was of a rougher Texture, attraded 
the North End, and repelled the South End of the 
fame - : When it was alfo obferved, that the Polarity 
1 appeared 
