of Inglehorotigh above the Level of the Sea, 



435 



Sector on board. Eye 4 feet above the ground at the signal. 

 — (G.) October 4, 1830, from llj a.m. to \\ p.m. Sector on 

 the rock. Eye 5 feet.— (H.) October 15, 1830, from 1^ to 

 2^ P.M. Eye 5 feet.— (I.) July 25, 1832, from 6^ to 7 P.M. 

 Sector on board. Eye 3j feet. 



Ft. 

 Hest Breakwater Pole, top \ 



20830 



F 



H 



I 



P 



H 



[■ 



do. 

 do. 

 do. 

 do. 



Ingleborough'i 

 do. 

 do. 

 do. 

 do. 

 do. 

 lo. 

 do. 

 do 

 do 



[-247] 



[Tower 

 > top. 



■ +22-3] 



{. £ } 



[+1-0] 



1 



p / LancasterChurch tower, top 



\ do. 



F Hest Wall, top 



F Cloiigha West Pike, top 1 



[+6-5] / 



F Farleton Knot 



G Hutton Roof Moor 

 E Horizon of the Sea to the 1 

 S.S.W. atl^-SS-^P-M.*/ 



20836 



20834 

 20836 



81847 



81837 



82046 



36097 



22227 



46944 



29346 

 26032 



158520 



I 24 2 



24 

 24 

 24 



23 47 

 28 3 

 12 4 

 11 58 

 11 51 



11 51 



12 8 

 12 8 

 11 53 

 11 

 10 58 

 10 59 



32 14 



32 13 



1 12 7 



56 55 



36 53 



45 8 



?0 23 5 



Dp. 



El. 



Dp 



Dp. 



El. 



El. 



El. 



Dp. 



Ft. 



- 495-1 



- 495-8 



- 4960 



- 495-1 



- 494-7 



- 495-9 

 + 1840-3 

 + 1837-9 

 + 1835-2 

 + 1835-2 

 + 1841-3 

 + 1841-3 

 + 1835-8 

 + 1839-5 

 + 1839-1 

 + 1839-1 



- 306-9 



- 306-9 



- 451-9 



+ 821-5 



W. 



•5 Id. 



2-5 W. 

 5-51 



^Hd 



4-5 f^- 

 4-5J 



V- 



D. 



2 



3-5 



3 



n 



3 i 

 3-5J 



7 



337-1 

 361-1 



528-2 11-5 W. 



At Ingleborough. 

 Dates, (S.) September 2, 1829, from 11^ a.m. to 3 p.m. 

 Remarkably clear. Sector on signal pile. Eye 4 feet above 

 its base.— (T.) October 26, 1830, from 12^ 30"^ to 2'^ 30™ p.m. 

 Very clear, but intensely cold, with flakes of snow. Sector 

 as before. Eye 4 J feet. 



* It has been demonstrated at page 270, vol. v. that the included arc 



will be equal to the observed dip plus twice the refraction ; consequently 



when the latter is ^ the apparent dip will be to the arc as 15*5 to 17-5 



The angle (23' 5") increased in this proportion becomes 26' 4", for which 



/ 26' 4" \ 

 arc the refraction will be 1' 29"-5, and the curvature (^— g— =) 13' 2". 



With the distance corresponding to the arc (158520 feet,) and the tangent 

 of the dip, corrected for curvature and refraction (=11' 32^") the height 

 of the eye will be 532-2 feet and that of the Crag 528-2 feet. 



3K2 



