( ) 
after I gave an account of it to the Society in a Letter to 
Dr. Slonne, (who was then Secretary,) dated June 2 5-. 1 7 1 z. 
Since thar, Mr. Havrkesbee made another Experiment of 
the fame nature with a fmailer Loadftone ; which he has 
given an account of in # the Pbilcfopbical Tranfaflions No. 
335*. But upon comparing the Numbers of that Experi- 
ment with thofe of the other, I find the Numbers of the 
firft Experiment to be very much more regular. Where- 
fore I conclude that to be the beft Experiment, and fince 
no notice has been taken of the Account I gave of it, and 
I have reafon to believe Mr, Harvkesbee loll the Table I 
left with him for the Society, of rheNumbers relating to 
it, I take this occafion to prefent the Society with the fol- 
lowing Account of it. 
We placed the great Loadftone belonging to the Royal 
Society fo, that it’s two Poles lay in the Plane of the Ho- 
rizon, and were in a Line exa&ly at right Angles with 
the natural Dire&ion of the Needle we made ufe of, 
(which was that Dr Halley had made to obferve the Vari- 
ations with). And by means of a Carriage contrived for 
thatpurpofe, the Stone was eafily moved to and fro, the 
Poles continuing always in. the fame Line^ The Needle 
was fo placed, that the Center it play’d upon was in the 
fame Line with the Poles of the Stone 4 the North Pole 
being towards the Needle. We meafured the Diftances 
from the Center of the Needle to the Extremity of the 
Stone ; and we found the Variations of the Needle from* 
its natural Polition to be as in the following Table. 
Diftant. 
,Feet 
1 
2 
3 
Variat. 
o / 
81 4$ 
58 00 
30 00 
Diftant. 
Feet 
4 
5 
6 
Variat. 
o # 
16 o 
9 20 
5 35 
Diftant. 
Feet 
p 7 
8 
9 
Variat. 
3 3 ° 
2 20 
1 35 
V. Ai 
* 
