174 



i 



ON THE SQUARE BAR MICROMETER. 



Observed Transits . 



Comet South 



Star North. 



Comparison, 



m. 



15 45 20.3 

 49 16.9 

 53 17.0 

 57 53.0 



17.2 

 26.4 

 13.1 



t x . 



*2* 



m. 8. 



42 58.2 



in. a. 



43 50.3 



46 59.1 



47 49.7 



51 2.6 



51 52.5 



55 43.4 



56 32.2 



Reduction; Equation (1) 



AND FOURTI 



\ 



Comp. 



<:, + 1 % 



2 • 



1 t 



2 



a! — a. 



1 



h, m. ■. 



15 45 45.70 



in. 8. 



43 24.25 



in. 8. 



+ 2 21.45 



1 2 



49 47.05 



47 24.40 



22.65 



3 



53 51.70 



51 27.55 



24.15 



4 



58 33.05 



56 7.80 



25.25 



Sid. chron. 



15 51 59.38; 





+ 2 23.38 



Chron. corr. 



-16 48.7 





l°g(V-*i) 

 log-V 1 



Sid. time, 



15 35 10.7 



Reduction, 



6 33 5.0 



* 



log cos 8 



[ 



of Equation (4) 



Cam.M.T. 



h. m. s. 



9 2 5.7; 



m. 



+ 2 23.38; 



50.8 

 60.3 

 69.4 

 80.1 



65.15 



1.81391 



0.87506 

 9.60889 



2.29786 



t 2 t t . 



50.35 



1.70200 

 0.87506 

 9.60632 



2.18338 



+ 198.55 + 152.54 = + 351.09 



8 58 J 1 



889.80 



538.71 



Refraction Correction. 



CONSTAKTS 



lo g ( ~ 9) 

 log {d'-d) 



log cos 8 



log tan S 

 log 



n 2.949 



n 2.732 



9.608 



0.353 



6.435 



log tan £ 



tan 2 £ 



log 



log sin q 

 log sin 2 q 

 log cos 2 q 



0.387 

 0.774 

 9.686 

 9.930 



9.719 





