6 Mr. Nixon on the Measurement (by Trigonometry) of the 



a most favourable distribution of light and shade to render 

 the dull masses of the standards distinguishable, at a distance 

 of twenty miles, from the dark sides of the ridge immediately 

 behind them. 



The horizontal angles were all measured on the six-inch 

 theodolite already described, and generally in opposite di- 

 rections of the telescope within its Ys, of which the mean 

 readings, corrected for the distance of the instrument from the 

 signal, are given in the Registers. 



In the event of the measurement of a distance from more 

 than one base, the mean of the results, when not sufficiently 

 accordant with each other, has been determined by the formulae 

 given in the Phil. Mag. and Annals, N.S. vol. v. page 354. 



Register of the Measurement of the Horizontal Angles. 



At Shunnor Fell. 



Readings. * Nine Stan- 

 Water Crag 0° 0' 0" dards Hill 

 Rogan's Seat 3 8 42 

 Keasdon 15 23 38 

 Great Pinch Yate 18 20 12 

 Blake Hill 23 5 34 

 Dod End 23 27 23 

 Brownsey 23 55 6 

 Harker 42 22 45 

 Satron Hangers 48 12 6 

 Pickington Ridge 52 SO 17 

 Bakestone Edge 61 5 32 

 Great Whernside 99 4 20 

 * Pen-y-gent 134 45 16 

 Dod Fell 135 43 47 

 Knoutberry Hill 162 58 15 

 Ingleborough 157 39 25 

 Pillar Hill 247 6 5 

 Hugh Seat 262 53 31 

 282 58 17 



The Tail Brigg 



Nine Standards 



Hill 

 East Stonesdale 1 

 Moor J 



} 



297 37 47 



350 22 51 



At Water Crag. 

 Rogan's Seat 10° 12' 52" 



f Ingleborough 10 20 54 

 Shunnor Fell 25 58 58 



Hugh Seat 53 33 20 



Readings. 

 | 76° 29' 32" 



Highest Standard 78 46 54 



The Hoove 230 48 47 



Great Pinch Yate 273 25 43 



$ Whitfield Hill 280 56 15 

 Robincross Hill 282 10 5 



Gibbon Hill 293 57 16 



Pickington Ridge 304 55 12 



Brownsey 307 4 19 



Satron Hangers 321 9 31 

 + GreatWhern-> ? 



side ^ 



Settronside 331 16 43 



Blake Hill 338 9 12 



Bakestone Edge 340 54 17 



At Ingleborough. 

 Shunnor Fell 0° 0' 0" 



f Water Crag 6 42 28 



Bakestone Edge 17 45 



Great Whernside 66 10 27 



Hugh Seat 347 31 52 



At Bakestone 



Edge. 



Keasdon 



0°35'46" 



East Stonesdale "1 

 Moor J 



12 3 56 



Rogan's Seat 



23 19 40 



Water Crag 



29 31 18 





Blake 



