£ 134 ] 
EXPERIMENTS ON THE DIPPING NEEDLE. 
lii Hudfon’s Straits, July 28, 1774, lat. 62° 25' North, 
long. 71° 30' Weft from London, variation per azi- 
' math 44° Weft. 
« f 
83 o 
83 o 
83 30 
83 0 
81 30 
81 40 
82 8 
82 o 
I The index pointing Weft. 
I The index pointing Eaft. 
I The poles changed, and index Eaft. 
I The index pointing Weft. 
Thefe obfervations were made with the afliftance of 
Captain Richards, on a table in the cabbin of the Prince 
Rupert. We ufed all imaginary care to render them 
exa6t; yet, at the conclulion, I found the ftiip, though 
faft to a field of ice, had altered the pofition of her head : 
for by placing the index to the North line of the inftru- 
merit, the needle ftood at 88° 10' Weft, inftead of being 
perpendicular at 90^ 
0 
X X PE- 
