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EXPERIMENTS ON THE DIPPING NEEDLE. 
In Hudfon’s Straits, July 23, 1774, lat. 62° 3' North, 
long. 69° Weft from London, variation 43° Wefterly. 
83 45 
82 40 
The needle vibrated from an horizontal lituation. 
Thefe obfervations were made on a large piece of ice, to 
which the three fliips were grappled. I imagine the firft 
four experiments may be depended on, as it was calm 
weather; but afterwards, a breeze ipringing up gaye the. 
ice a circular motion, which made it impollible to. keep 
the inftrument exa 61 ;ly in the magnetic meridian, as may 
be feen in the fifth and fixth experiments. I re-adjufted 
the inftrument for the laft obfervation ; but finding the 
ice ftill continued in motion, I judged it unneceftary to 
make any farther experiments at this time, as it could 
not be done with that exadlnefs I could wLfh, or give fa- 
tisfaftion to the learned Society to whom I have the ho- 
nour of tranfmitting thefe remarks. 
O 
82 50 
82 30 The Index placed Eaft. 
82 40 
81 50 
82 45 
EXPE- 
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