THE PACIFIC OCEAN, 3<o 



ire daily error, or finding its new rate, the fifth' column £{ r b 9 e "_ 

 has the longitude according to its laft rate, calculated from ' — -*- — * 

 the true longitude of the place laft departed from. The 

 fixth is the true longitude of the place deduced from aftro=- 

 nomical obfervations made by ourfelves, and compared' 

 with thofe made by others, whenever fuch could be ob- 

 tained. The feventh column fhews the difference between 

 the. fourth column and the fixth in fpace ; and the eight 

 the fame difference in time. The ninth fhews the number 

 of months and days in which the error, thus determined, had 

 been accumulating. The difference between the fifth and 

 fixth columns is found in the tenth, and fhews the error ofr 

 the time-keeper, according to its rate laft found, in fpace ; 

 and the eleventh, the fame error in time. The twelfth 

 contains the time elapfed in failing from the place where 

 the rate was laft taken, to the place whofe longitude is 

 laft determined. The thirteenth and fourteenth contain 

 the ftate of the air at the time of each obfervation. 



As perfons, unaccuftomed to calculations of this fort, may 

 find fome difficulty in comprehending the nature of the 

 table, the two following inftances will more clearly ex- 

 plain it. 



Thus, on the 24th October, 1776 (firft column), at the Cape 

 of Good Hope (fecond column), we found the daily error in the 

 rate of its going, to be 2",s6 (third column). The longitude 

 of that place calculated on a fuppofition, that the rate of 

 the time-keeper had continued the fame from the time of 

 our leaving Greenwich, that is, had a regular daily error 

 of i",2i, is found to be 18 26' 30" Eaft (fourth column). 

 And as its rate at Greenwich is, in this inftance, its lateft 

 rate, the longitude thus found is the fame (fifth column), 



The.- 



