C 79 3 
VII. Befcription of a new Dipping-needle. By Mr. J. Lo- 
rimer, of Penlacola, in a Letter to Sir John Pringle,, 
Bart. P. R> S. 
TO SIR JOHN PRINGLE, BART. P. R. S. 
SIR,. Penfacola, Sfept. 13, 1773. 
Redde, Feb. 2, T T 7 HENEVER any one meets with a ter- 
^ ^ rella^ or fpherical loadflone, the firR 
thing he does is to find out its poles ; and having once 
difcovered them, he knows immediately how any fmall 
bit of needle will be afFedled, if it is placed upon any part 
of the furface of that terrella. The poles are moft readily 
difcovered by trying where the filings of iron, or a fmall 
bit of needle, will hand erect upon the terrella\ and this 
is generally found to be upon two points which are dia- 
metrically oppofite- to one another. But the magnetic 
poles of the earth feem to be fituated obliquely to one ano- 
ther (fee the Berlin Memoirs, 1757); but where they are 
a-ftually lituated is.hitherto unknowni; whether they are 
upon land or w'ater;, or in. either cafe, whether we can 
come nigh to them. Yet be thefe things as they may, it 
appears evident to me, that accurate oblervations, made 
as near to thele magnetic poles as jwflible, with a good 
dipping- 
