C 479 ] 
Experiments made April 22, 1772, with the other 
Dipping-needle, the inftrument being put in the 
fame place, and with great care, in the magnetic 
meridian, the needle pointed as under. 
o r 
72 
72 
72 20< 
J 5 
10 The poles of the needle changed. 
fThe fide of the inftrument to the 
Eaft, which in the firfl obfervation 
was to the Weft. 
Left any thing magnetical fhould have affedled the 
needle in Mr. Nairne’s houfe, he took this inftru- 
ment, and placed it in the middle of a large room 
belonging to the London Afturance in Birchin- 
Lane, and then the needle pointed to 
° / 
72 10 or 15 
72 20 
72 30 The poles of the needle changed. 
f The fide of the inftrument to the Eaft, 
72 1 o-| which in the firft obfervation was to 
l the Weft. 
The dipping-needle brought back to Mr. Edward 
Nairne’s, and put in the fame place as before, 
flood at 
° / 
72 10 -f- 
Thc 
