of Van Diemen's Land. 



97 



Extract from Book of Calculations of Latitudes and Bearings. 



E Observed greatest Elongation of a Star. 



E E Angle subtended by point of reference and greatest elongation 



east. 

 W E Ditto ditto ditto west. 



A Elevation of a Star at its greatest Elongation. 

 PD South Polar distance of star. 



L Latitude of place of observation. 



Dromedary Station. 



Observation. — a Argus=179 29 le'e a Argus west =247 10 3-3 



Brown Mountain=121 35 53-3 Brown Mountain = 80 15 16-6 



EE=54 53 23-3 WE... =166 19 467 



Mean of WE=166 19 47-9 aArgusW =181 24 25-0 



Brown Mountain= 15 4 35-8 



2)111 26 24-6 



E= 55 48 12-3 WE =166 19 49-2 



Cos L — Si"- ^ P « Argus PD = 37 23 1-8 Sin. 9-7832971 



Sin. E E = 55 43 12-3 Sin. 9-9171355 



L = 42 42 38-8 Cos, 9-8661616 



Assuming this to be the Latitude of the Dromedary Station 



and Sin. A = /'"-.^^^ and Sin. E =^iBiZ^, E is calculated from 

 Cos. P D Cos. L 



each observed elongation. 



a Crucis P D =:27 43 32-2 

 L=42 42 38-8 Sin.=9-8314204 Cos.=9-866l616 



PD=27 43 32-2 Cos.=9-9470343 Sin.=9-6676750 



Nat. Sin. A =.77 = 9-8843861 E =39 17 1-1 Sin.= 9-8015134 



Observation.— Biovm Momatain 89 59 55-0 Levels. 



a Crucis 161 19 31-3 43 26 



43 26 



71 19 36-3 



Correction for level + 13-1 43—26 = 1 7+ 



-77 



71 19 49-3 



E 39 17 1-1 119 



119 



Bearing of Brown Mountain S 110 36 50-4 E 



13-09 



N 



