lite. 



By the Sector. 



Differences. 



13 42 



90 12 23" 



/ // 

 -1 19 



8 7 



90 6 58 



-1 9 



9 27 



90 8 48 



-0 39 



56 55 



89 55 32 



— 1 23 



126 Mr. Nixon on the Measurement {by Trigonometry) of the 

 By Ramsden's Theodolite. 



The Calf 90 



ShunnorFell 90 



Great Whernside 90 

 Whernside 89 



Thejirst column of the subjoined register of the measure- 

 ments by the horizon-sector contains the names of the hills 

 of which the ground at the base of the signal, unless otherwise 

 expressed in italics, had been observed ; — the second the mean 

 of the readings by the two indices, of the elevation or depres- 

 sion, each corrected for the constant error of the instrument 

 and the deviation of the bubble from its reversing points; 

 the further reductions, requisite to obtain the differences of 

 level given in the third column, being for the height of the 

 eye, the curvature of the earth, and the constant refraction of 



27"*5. The last column, given merely as a test of the 



goodness of the observations, exhibits the deviation of the 

 error of collimation of each (pair of) observations, from the 

 mean error of the whole. 



At Piclcington Ridge. 

 June 6th, 1829. Height of Eye 3\5 feet. 



A very cold and clear afternoon, with a steady dry wind from 

 the E.N.E. 



o 



The Hoove 



Calvey 



Dod End 



Satron Hangers 



Gibbon Hill 



Grinton Grits 



Robincross Hill 1 



Whitfield Hill 1 



Blake Hill 



Water Crag 







Shunnor Fell 



Great Pinch Yate 



Rogan's Seat 



Nine Standards Hill... 



Bakestone Edge.. 



Brownsey 







Feet. 





n 



6 33 



depr. 



36-3 lower. 



3-5 



48 19 



... 



260-2 



... 



2-5 



22 37 



... 



175-2 



... 



0-5 



22 23 



... 



81-6 



... 



2 



37 16 



• •• 



75-6 



... 



10 



55 33 



... 



178-6 



... 



4-5 



8 19 



... 



448-9 



... 



10 



55 



... 



506-4 



... 



2-5 



1 5S 



... 



6-4 h 



igher. 



2 



25 46 



elev. 



... 



... 



6 



25 50 



... 



331-9 



... 



5-5 



30 56 



... 



494-2 



... 



1'5 



4 38 



... 



59-1 



... 



2-5 



29 5 



... 



348-0 



... 



2-5 



11 6 



... 



316-4 



... 



2 



7 6 



... 



64-4 



... 



4 



2 50 



. .. 



38-2 



... 







At 



