>9° 



The Account of a 



No. of 

 triangles 



VI. 



Names of stations. 



Carraton Hill 

 Black Down 



St. Stephen's Down 91 18 12,75 



Observed 

 angles. 



o / // 



48 57 8,25 



39 44 39 



180 o o 



DifF. 



—0,24 



— 0,22 



Spheri- 

 cal 

 excess. 



0,89 



Error, 



-0,89 



Angles corrected 

 for calculation. 



O I II 



4.8 57 9,25 



39 44 38,5 



91 18 12,25 



St. Stephen's Down from { j*™*" HiU _ " 



Distances. 



Feet. 



\ Black Down 

 Distance from Carraton Hill to Kit Hill, 33427 feet. Phil. Trans. 1797. p. 459 



52991,3 

 62506,7 



VII. 



Carraton Hill - - 

 St. Stephen's Down 

 Kit Hill - 



70 15 32 

 37 1 56 



-0,14 

 -0,11 



70 15 32,25 



37 1 55>75 

 72 42 32 



Carraton Hill 



St. Stephen's Down from/ §£3jJ 

 Mean distance from St. Stephen's Down to Carraton Hill, 52292,7 feet 



5299+ 

 52240,4 



VIM. 



St. Stephen's Down 

 Black Down - 

 Kit Hill 



54 16 13 



5 2 57 37 



—0,19 

 —0,19 



54 l6 I2 >5 

 5 2 57 36,5 

 72 46 11 



Black Down from 



f Kit Hill 



53128 

 62509,2 



\ St. Stephen's Down 

 Hence the mean distance from Black Down to St. Stephen's Down, is 62508 feet. 



In the third triangle, the angle at Cadon Barrow is supplemen- 

 tary. When the observations were made at that station, a direction- 

 post at Bodmin Down was mistaken for the staff, (to which it was 

 similar in shape,) erected at no great distance from it. This error 

 was not detected till long after : and, although it has been a maxim 

 to which we have generally adhered, of observing all the angles of 



