434 Mr. Nixon o?i the Measurement (In/ Trigonometty) of the 



Dod Fell and Shunnor Fell 

 Penhill and Bakestone Edge 

 Bakestone Edge and Settronside 

 Bear's Head and Penhill 

 Penhill and Dod Fell 

 Shunnor Fell and Settron Fell 

 Penhill and Pen-y-gent 



Sum (rejecting the first) 1° 40 50 5' 48 



Mean refraction 1-1 7th. 

 The registers of the measurements by the horizon-sector 

 will require explanation. The^rst column contains the name 

 of the hill of which the ground, unless otherwise stated, had 

 been observed ; the secoiid, the mean of the readings by the 

 two indices of the elevation or depression, each corrected for 

 the constant error of the instrument and the deviation of the 

 bubble from its reversing point ; the third, the diiference of 

 level of the cain at Penhill, the walls at Settronside and Pen- 

 y-gent, and the ground at the other stations and the summit 

 or other given part of the observed hill ; the latter being higher 

 or lower than the former according as the difference is marked 

 H or L. — The last column, given merely as a test of the good- 

 ness of the observations, exhibits the difference between the 

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

 mean error of the whole f . 



At Seftro7iside Wall. 



The measurements marked* were made July 9th, 1828; a 

 cold but clear day accompanied by a tremendous wind ; the 

 othei's were made on the following day, of which the earlier 

 part proved remarkably bright and clear, but was succeeded 

 by partial mists. 



Height of the eye above the wall 0*5 feet. 



Feet. 



*Penhill, Cam top 51' 22" depr. ... 8" 

 51 15 489-0 L. 



♦Little Whernside 50 36 ... 7 



50 24 318-1 7 



* Rover Crag 65 38 ... 



. 65 30 754-3 4 



♦Great Haw 50 46 518-8 1 



Yockenthwaite Moor 37 35 195-2 4 



Bear's Head 28 22 287-3 I 



Lovely Seat 9 25 87-9 3 



f In the calculations the refraction has been considered to be without 

 exception 1-1 7th of the contained arc. 



Bakestone 



