100 



BULLETIN OF THE UNIVERSITY OF WISCONSIN 



WASHBURN OBSERVATORY, MAY 19, 1894. 

 COMPABISON OF CLOCK STABS WITH A. UBS^ MINOBIS. 



Observer, G. C. C. 



NOTES. The instrument was so set that the readings of 

 the azimuth circle are very nearly the true azimuths of the 

 line of sight. When the vertical circle is "Left " the zero 

 of the level scale is adjacent to the objective. The symbol 

 T 2 ' denotes the mean of the observed times on five threads, 

 and requires a correction to reduce it to T,. T^ was ob- 

 served on the middle thread only. The thread intervals 

 are assumed to be 



I = - 31.5 II = - 20.5 III = 0.0 IV = 4- 20.3 F = 4- 30*8 

 the signs corresponding to an observation Circle R. Star W. 

 It should be noted that owing to the reversal of the instru- 

 ment the effect of any small error in the adopted thread 

 intervals will be eliminated. 



The coordinates of A Ursce Hinoris and the other constants 

 requisite for the reduction, are : 



a x =19 29 25.6 log sin n = 8.25491 



, 2 sin" - it 



1 

 43 



1 49.88 



5 (assumed) 



=1.5232 



sin 1 



Iog'2cosec2 g> = 0.3020 



Hourly rate of chronometer = 0.04 



