AN ABSTRACT ot OBSERVATIONS on the DIP of the HORIZON at SEA, made in His Majesty’s Ship Hecla, in 1820, 
with Dr. Wollaston’s Dip Sector. 
ON THE DIP OF THE HORIZON AT SEA. 
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The Tabulai Dip is taken from Mendoza Rios. The Observers were Captain Parry, Lieutenant Beechey, Mr. Ross, and Captain Sabine. 
