1 68 Mr. J. Nixon on tie Trigonometrical Height 



The angles taken at each end of the base were by a pocket 

 sextant (by Allan) reading off to l' or less, of which the 

 index error, scarcely appreciable, had not sensibly varied in 

 the course of two years. Both rods being about 5 feet above 

 the ground, the observations were made with great nicety by 

 supporting the sextant on the top of the rods. 



Rod at north end of base 37° 1' 0" \ 1037*5 inclined, or 

 Rod at south end of base 83 38 45 J 1034-0 horizontal feet. 

 Ingleton church tower,\. . 



topofN.W.pinnaclej^ 59 20 15 ) 



The distances from the north end of the base to the top of 

 the church tower, and to the ground at its west base, may be 

 estimated severally at 1034 feet; but that to the projecting 

 ledge should be called 1033 feet. 



Vertical Angles measured by the Sector at the north end of 

 the base. Height of eye 4 feet 10 inches. 



Top ofN.W. pin-1 

 nacle of Ingleton ^> 

 church tower J 



Top of Ingleton ~) 



church tower 



near N.W. an£ 



Ingleton church ~) 

 tower, highest 

 ledge at N.W 



i 



! Arc G. 

 o / // 

 E.4 45 274 \ 

 35 / 



E. 4 32 52| \ 

 33 J 



E. 4 12 \ 



n) 



E. 1 40 



D. 1 16 224 



27 



) 

 J 



i\ 



hi 



85-5 

 68-5 



64-5 



+.8 



Ingleton church 



tower, ground 



at west point.... 

 Top of rod at south 



end of base 



Ground at south end of base (15-07+4-83 height of rod =) -19-90 



77-5 



72-5 



73-5 



Arc L. 



4 45 32! 

 30 



4 33 15 

 12 



4 12 71 

 V. 



) 

 i) 



?} 



E.ofi Diff. of 

 I^'el-IColl. Level. 



_8 +91-03 



7i-o 



64-5 

 65-5 



1 40 474 ) 

 40 / 



1 16 m\ 



mi 



64-0 —2 



+6 



-6 



+87-21 

 + 80-80 



+35-16 

 -15-07 



The fall from the ground at the south end of the base to 

 the spring of the west end of the north side of the great or 

 eastern arch of Thornton bridge, (a distance of about 35 

 yards,) was found by the 8-feet levelling staff, and a 12-inch 

 telescopic level, (adjusted on the wires of the sector,) to be 

 6*38 ieet. Having measured by the sector, placed at an in- 

 termediate distance, the elevation of the south end of the base 

 and the depression of the spring of the arch, and obtained by 

 the tape the corresponding distances, the difference of level 

 appeared to be 647 feet, the mean of the two measurements 

 being 6*44 feet. The fall from the bridge to the confluence 



