S 1 ' 



MEASUREMENT OF AN ARC 



_ <t 



^j 



"C 



m " 



Perpendicular. 



Commencement 



m 



CB 



j 



J£ 



"3 <« 



.2 



i- (— ^ 

 O « = 



from the last. 



>- 



a 



1 



3 

 3 q 



5 S? 





CD C ^ 



1 — .— Oj 



— CC r> 



a g — 







« u 

 c 



01 



REMARKS. 



1 

 Ascents. Descents. 



Above. 



Selow 



J£ 



V 



w 



K 











H ■ 











, t 



?£ET. ~" 



A'ETT. 



FEET. 



INCHES. 



INCHES. 







6 



500 



14 00 



. .00415 





2.04 





10.8 



101.4 





7 



400 



5 37 



.00052 



0,65 



15.2 





80.2 





8 



800 



2 15 



.00016 



1 



l 



0.52- 



9 





95.2 





9 



800 



5 00 



.00088 



1 



1.16 







100 8 





10 



900 



"> 23 09 



.02043 



|- 



6.06 





1(15 

 5 X 7 



92.1 



! 



! U 



600 



09 09 



; .00210 



1 



6.60 





107.1 



12 



700 



31 45 



.02986 





1.47 





16.1 



83.3 





13 



' 800 



30 00 



.03048 





6,98 





13 



10-JJ 





14 



400 



28 57 



.01420 





3.37 





8 5 



114.5 





15 



700. 



34 12 



.03465 





6 ,.96 







81.5 





16 



700 



23 06 



0158.! 





4.70 





1.5 



95.7 





17 



900 



23 57 



.02187 





6.27 





4.5 



92.1 





18 



900 



25 15 



.02421 



\ j 



6.61 



15.5 





96.6 



' 



19 



800 



21 03 



.01504 





4.90 



5 





98.8 





20 



900 



15 57 



.00963 





4.18 





4,6 



89.1 



i 



21 



800 



a 14 12 



.00680 





3.30 





3.7 



9S.1 



■ 



22 



900 h2 SO 



.00603 





3.27 





2.2 



90.1 





23 



70o!0" Oil 15 



.00004 



0.25 





4.5 



110.8 





24 



700 19 15 



.01099 





3 ff 







89.2- 



1 



25 



900 10 55 



.00450 





2.86 



5.7 





96.4 





26 



900 



) 08 Ofi 



.00252 





2.12 





4.2 



100.9 





27 



' ! 80o 



D 07 00 



.00168 





1.63 





12.1 



88.2 





28 



1000 



J 13 1 c l 



.00760 





3.89 



2.2 





110.3 





■29 



600 



3 16 27 



,00684 





2.87 





5.3 



89.3 





30 



900 



J 23 54 



.02178. 





6.26 





10.7 



106.1 





31 



800 17 49 



.010^2 





4.15 



14 





92.5 





32 



700 00 45 







0.15 



8.3 





107.1 



> 



33 



70o!o Level 











3.2 



99.8 





34 



1600 12 44 



.01104 



5.93 







5.8 



104.9 





35 



8000 01 08 



.00002 





0.26 





8.5 



103.5 



\ j 



3e 



6000 08 33 



.00186 





1.49 



1,8 





104.9 



j 



37 



1300O 13 27 



■ .01001 





5.09 





5.7 



108 .9 





' 38 



9000 17 12 



.01125 





4.50, 





13.0 



81.8 





— 3d 



2000- 01 35 



.00002 



0.09 









99.7 





40 



7000 17 24 



.00896 





3.51 





18.7 



110.8 



Completed 4 th 



41 



500i0 20 00 



.00845 





2,91 





6.5J 



80. 1 



May 1811. 



Descent from the termination 



^TTti'e lialtj- to ETTe gTouuSj 

 < 6.92J 138.6] 106.7 



%i.p 



! 



97.13] 



Tot.|32600| 



| 43673 

 Base abo 



239.2 







N. end of the 



ve - S. end of the Base in "perpendiciil 



ir height 



142.98 feet." 



















At the" commencement s the old chain exceeded the new one 

 Qc.41 divifions of the micrometer equal to .01218 feet.. 



