'QUEEN CHARLOTTE ISLANDS. 237 B 



For time, on Alkaid : — 



Time by watch 8h. 48m. 44s. Star 82° 59' 27'' 



« a 8h. 52m. 33.5s. — " 82° 01' 37" 



Latitude assumed from observation above, on Altair 54° 07' 48" 



Resulting latitudes : — 



First approximation \ ^ 



Second approximation (with assumed latitude 54° 08' 30") 



Third approximation (with assumed latitude 54' 07' 10) . . . 



A graphic method, based upon these approximations, shows that the values of the 

 third approximation are correct to the nearest second. 



Resulting error of watch (deduced from third approximation) . .18m. 48s. slow 



From this error of watch the observation on Altair is reduced, ani a mean aluev 

 of the latitude found as follows : — 



Altair past meridian 0m. 35s. 



Corresponding hour angle 8' 45" 



True meridian altitude of Altair 44° 25' 14" 



Resulting latitude 54° 7' 47" 



Mean latitude : — 



54° 



7' 



1" 



54° 



7' 



13" 



54° 



7' 



0" 



54' 



7' 



12" 



54° 



7' 



2" 



54° 



1' 



14" 



Pole Star observations 



Observation on Altair (deduplicated) . 



( 54° 



7' 



2" 



{ 54° 



7' 



14" 



f 54° 



7' 



47" 



{ 54° 



7' 



47" 



4|216° 



49' 



1 50" 



54° 



7' 



27" 



North Island, August 24. 



(One hundred and eighty paces N. 43° E. from south point of island.) 



Observation on Pole Star. 



Timebywatch 9h. 50m. 22s. Polaris 109° 6' 52" 



" " 9h. 55m. 48s. " 109° 11' 32" 



« " lOh. lm. 50s. » 109° 15' 2" 



« '! lOh. 7m. 25s. " 109° 19' 22" 



The error of watch as deduced from error August 23, and rate, allowing tor 

 ■change of longitude, is 19m. 8s. slow. 



Resulting latitude from the four observations : — 



54° 10' 19" 



54' 10' 48" 



54° 10' 37" 



54' 10' 53" 



Mean.. 54° 10' 39' 



