59 6 



The Account of a 



No. of 

 triangles 



Names of stations. 



Observed 

 angles. 



Diff. 



Spheri- 

 cal 

 excess. 



Error. 



Angles corrected 

 for calculation. 



Distance*. 



XX It I. 



Moor Lynch 

 Ash Beacon 

 Pilsden 



: 



O | II 



57 >9 3>5 

 76 2 36,5 



—0,64 

 -°>39 



11 



t 



• / 11 



57 »9 2,5 

 76 2 36 

 46 38 21,5 



Feet. 





'ilsden from Moor Lynch 





I 18230 



But Pilsden was also observed from Dundon Beacon ; from which, and the angle observed 

 at Moor Lynch, between Dundon Beacon and Pilsden, results the following triangle. 



XXIV. 



Moor Lynch - 

 Dundon Beacon 

 Pilsden 



56 43 36,75 

 108 I 52 



+ 0,03 

 -0,64 



5 6 43 3 6 '5 

 108 1 51,75 



Pilsden from Moor Lynch 



118233,6 



Hence, the mean distance from Moor Lynch to Pilsden is 1 18231 ,8 

 feet ; and this is the side from which the series about to be carried 

 on, for the survey of the north of Devonshire, is to originate. 



In the triangle formed by the stations on Mendip Hills, Bradley 

 Knoll, and Westbury Down, the distance between the first and last 

 is 92954,0 feet; but, computing with the mean distance from 

 Mendip to Bradley Knoll, (61962,3 feet,) as found from both bases, 

 the distance from Mendip to Westbury Down proves to be 92955,9 

 feet ; which distance is used in the remaining principal triangles in 

 this quarter. 



XXV. 



Farley Down - 

 Westbury Down 

 Mendip Hills - 



77 2 » 53.75 

 63 42 51,25 



38 55 J 7>5 



—0,44 

 -0,34 

 -0,3" 



18/j o 2,5 1,10 +1,40 



Mendip from { Wettbu^yDown ' 



77 21 52,75 

 63 42 49,75 

 38 55 17.5 



85412,2 

 9 2 955»3 



