SI 



MEASUREMENT OF AN ARC 



' SERPENTIS. 



t 4^U%_j. O'i-,1 Jtvi j^si' v^- "■ 



Nearest point on the Lmhy 1 \o N: 



i .„.-^.-- 









Correct 



Thermometers. 



^ 1811. 







Observed 





__^ 



Face. 



Zenith flistance. 



Corrections. 



Zeniih distance. 







Monih» 



Upper. 



Lower. , 









...-...,* .^ X •' 



+ 









i 









O rfifr^^'ur- 



( < 



o 



( (< 



o 



o 



May 



I 



E. 



1 11 10.63 



I 8 15(5 





12 j-s-rsa 



81 



81 





3 



W. 



1 U 17.5 1 



1 7.832 





12 25.342 



81 



81 





4 



E. 



1 11 11.88 



1 7.669 





12 19.549 



78 



78 



i 



5 



w. 



1 11 19.73 



1 7.506 





12 27.266 



81 



81 





7 



E. 



1 11 10.38 



1 7.174 





12 17.554 



84 



84 



' 



8 



w. 



1 11 21.01 



1 7.011 





12 28 021 



86 



86 





9 



E. 



1 11 10.63 



1 6.837 





12 17.467 



86 



85 





15 



W. 



1 It- 2^-.13 



-1- &-.78S 





12 2fr.916- 

 Menn 



84 



84 



80.13 



80. 1 3. 



i^. 



id. 



m 



■, HERCULIS. 



I £0-3,8^ tt £ 



Neaxtst point ori the L^ 30 iV. 



680. T.^ £* a 



n 



irt\.!:. 



M»jr 



1 



E. 



2 



w; 



3 



E. 



4 



w. 



fi 



E. 



7 



W. 



8 



E. 



9 



W. 







30 13.1 J 



"SO" 23.5 



30 14,5 



30 23.75 



30 13.5 , 



30 25.1? 



30 14.0 



4t^ v3o: 26.0m 



+ 

 56 135 

 5.5.968- 

 55.787 

 55 609 

 .6^.424 

 55.056 

 54.872 

 £4.864' 



31 

 31 

 31 

 31 

 3i 

 31 

 31 



9,265 

 T9.4^68 

 10.287 

 19.359 



8.924 

 20.186 



8.872 



31- 20.1384 



IVfesn 



81 

 77 



81 

 78 



82 

 84 

 86. 



85 



81.88 



81 

 77 



81 



78 

 82 

 84 

 8S 



85 



81 75 



«i^; 



I U\ 



Sf,08 



,iSI 0?! 



