626 The Account of a 



give 314309,6, and 314305,4 feet, respectively, for the distance 

 between Black Down and Dunnose : wherefore, the mean 

 3H3°7>5 f eet > = 59>528 miles, may be considered as the true 

 distance between those stations. 



Direction of the Meridian at Black Down. 



On the 18th of April, in the forenoon, the 

 angle between the Pole Star, when at its 

 greatest apparent elongation from the meri- 

 dian, was observed, and found to be - 104 19' 19",25 



And on the 19th, in the afternoon - 98 42 47 



Half their sum is the angle between the 

 meridian and Abbotsbury staff - - 10131 3 



On the 20th of April, in the forenoon, the 

 angle between the Pole Star, when at its 

 greatest apparent elongation from the meri- 

 dian, was observed, and found to be - 104 19 25,25 



And on the 19th, in the afternoon - 98 42 35,5 



Half their sum is the angle between the 

 meridian and Abbotsbury staff - - 101 31 0,5 



Therefore, 101° 31' 2" may be taken for the angle between 

 the meridian and Abbotsbury staff. 



Art. xvii. — Latitude and Longitude of Black Down. 



The angle between Dunnose and the Abbotsbury Staff was 

 observed, and found = 164 26' 35" '25; and the angle between 

 the meridian and the same staf£ by double azimuths of the 

 Pole Star, 10 1° 31' 2," '. Wherefore their sum, subtracted from 

 360 , leaves 94 2' 2 2", 75, the angle which Dunnose makes 

 with the meridian. 



