102 On the Trigonometrical Survey 



Bearing of Meridian mark from my Observatory ... N. 5 E. 

 Angle of Meridian mark with Wellington 108 5 55.6 



N. 108 5 50-6 W. 



Bearing of Wellington from my Observatory S. 7154 9-4 W. 



(Signed) 

 30th August, 1853. JAMES SPRENT. 



Taking then the latitude of Hohart Town to he 42° 52' 

 25"*66, and the bearing of Mount WelUngton from the 

 Observatory in Church-street to be S. 71° 54' 9-"4 W. 



The diff. of latitude L— Z== ( ^d cos. z—^^"" Sin.z Z Tan. ^.^Seconds 

 \a 3 a / 



Here <?= 234867 = distance by the triangulation. 



3 = 71 54 9 '4 = Azimuth. 

 I ^ 4:2 52 25-66 = Latitude. 

 w =206264-8 



24856 X 5280 



a = = Eai-th's radius in feet. 



6-28318 



Log. to == 206264-8 == 5-3144251 

 Log. d = 23486-7 = 4-3708232 



Log. i= ^^?il8_ _ 2-6801158 



^ a 24856X5280 

 Cos. s = 71 54 9.4 = 9-4922478 



1-8576119 = 72-046= 1st Term. 



Log, V} = 5-3144251 



Log. d-- =2 Log. d = 8-7416464 



Log. "^2=2 Log. "^ = 5-3602316 



Log. I = 9-5228787 



Sin.'^ s = 2 Log. Sin. z ... = 9-9559316 

 Tan. Z = 42 52 25-66 ... = 9-9677377 



8-862851 1 = 0.073=2ad Term. 

 Difference of Latitude == 71*973=0° 1' U"-97 



Latitude of Church-street 42 52 25-66 



Difference of Latitude 1 11*97 



Latitude of Wellington 42 53 37-63 



i Sum of Latitudes 42 53 1-64 



\ „ Difference ditto 35.98 



