( 5 07 ) 
South Point dire&ed itfelf to no Degrees, I then fix’d 
a Board (likewife on the Floor) in a direft Angle from 
from the fame, the Graduations on which Board were 
3 Inches diftant from each other. The Needle was 
fufpended on a Point arifing from the Center of the 
Quadrant, from whence were meafured the feveral Sta- 
tions of the Magnet. The Magnet was laid on a thin 
piece of Board $ under which to one fide was nail’d a 
narrow flip of Wood, to Aide it along the fide of the 
fore-mention’d graduated Board, whereby the Stone 
might be always kept in the fame Direction to the 
Needle. The Stone that I ufed weighed about fix 
Pounds 5 was rough, and of an irregular Figure 3 yet I 
could dilcover no Inconveniency in the Experiment ari- 
fing from the fame, it being, and a&ing at all Diftances 
in the fame Pofition as it is firft plac’d on the Board ; 
And I fee no reafon to doubt, but the Proportions of 
its Power will be regular, and agreeable to the feveral 
Diftances ; as more than once I have obferv’d. For when 
the Stone hath been differently pofited on the fore-men- 
tioned thin board, different Angles of the Needle would 
enfue at the fame Stations 5 yet their Proportions one to 
another would be nearly the fame- My meaning is this: 
Suppofe the Stone was fo plac’d, as at 3 Inches from the 
Needle it would give the Needle an Angle of 90 De- 
grees, the Stone being continued in the fame Dire&ion 
at the feveral Stations, the Proportions of its Power one 
. to another would be much the fame, as if the Angle of 
the Needle at the firft beginning made but 87, or even 
but 80 Degrees on the Quadrant j for upon a (mail alte- 
ration of the Poles of the Stone, fuch diverfity of An- 
gles will arife. 
In thefe Experiments I made ufe of two Needles $ one 
of a Radius of 6 Inches, the other but of one Inch : 
Which laft, after abundance of tryals, I found to be 
moft accurate $ befides the Advantage it gave in begin- 
2 Z z z 2 . ning 
