177^' THK PACIFIC OCEAN. 291 



sort, may find some difficulty in comprehending the 

 nature of the table, the two following instances will 

 more clearly explain it. 



Thus, on the 24th October, 1776 (first column), 

 at the Cape of Good Hope (second column), we 

 found the daily error in the rate of its going, to be 

 2" 9 26 (third column). The longitude of that place 

 calculated on a supposition, that the rate of the time- 

 keeper had continued the same from the time of our 

 leaving Greenwich, that is, had a regular daily error 

 of 1* 21, is found to be 18° 26' 30" E. (fourth co- 

 lumn). And as its rate at Greenwich is, in this in- 

 stance, its latest rate, the longitude thus found is the 

 same (fifth column). The true longitude of the place 

 is 18° 23' 15" (sixth column). From whence it ap- 

 pears, that, in our run from Greenwich to the Cape, 

 the watch would have led us into an error only of 

 3' 15" (seventh column), or three miles one quarter; 

 or had varied 13" of time (eighth column), in four 

 months twenty-three days (ninth column), the period 

 between our leaving Greenwich and our arrival at 

 the Cape. As the Greenwich is the latest error, the 

 tenth, eleventh, and twelfth columns will be the same 

 with the seventh and ninth. 



But, on the 22d of February, 1777 (first column), 

 at Queen Charlotte's Sound, New Zealand (second 

 column), the daily error of its rate was found to be 

 2",91 (third column). The longitude of this place, 

 according to the Greenwich rate, is 175° 2.5' (fourth 

 column). But having found, at the Cape, that it had 

 altered its rate from a daily error of l', c 21 to 2'>26, 

 the longitude corrected by this new rate is found to 

 be 174° 54/ 23" (fifth column). The true longitude 

 of the place being 174° 23' 31" (sixth column) ; it 

 appears, that, in our run from Greenwich to New 

 Zealand, the error would have been only 1° 1' 29" 

 (seventh column), or sixty-one miles and a half, even 

 if we had not had an opportunitv of correcting its 



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