pendulum observations, and the preliminary observations for rate of " S.C." were made, 

 only to be stopped by the clouding of the sky and the approach of blizzards. In fact, 

 the only two sets of four clear days with no more than moderate wind, which occurred 

 during the first winter from the time of setting up of the pendulums until the return of 

 the daylight, were those on which the first two series of observations (A and B) were made. 

 Reduction, of Time Ulwmi/iuns. In the reduction of the observations, Mayer's 

 formula was used : 



T == U+i^?i^ + f K !HL(l/' '') . 

 cos tf ~~ cos S cos . 



In this, /, C and K represent respectively the values of the constants of inclination of 

 axis, collimation and azimuth. 



Owing to the fact that circumpolar stars could not be observed, there is very great 

 difficulty in deciding what azimuth constant to apply. The figures deduced for the 

 azimuth constant ou different days in series "A " were indeed so poor that no mean value 

 whatever could be assigned. A value of the azimuth has therefore been taken, deduced 

 from observations on July 31st and Aug. 1st, 2nd and 3rd during series " B." The 

 adopted value is A=10-0 sec. In series " A/' the uncertainty is not of very great 

 importance as practically the same stars were observed each night. 



With this azimuth constant, the results of the observation from individual stars 



are as follows : 



TABLE XX. 



35 



C 2 



