( 555 ) 
phase of the pole-motion ; after this the means of these values belonging 
to a same phase were taken, after changing the sign of o—e at lower 
culmination, because the influence of a variation of azimuth on o—e 
in both culminations has a different sign. Finally for each observer 
the deviations of these 43 numbers from their mean has been formed, 
which deviations after the reduction from differences in time of 
transit to differences in azimuth, represent the still remaining influence 
of a periodical change of the pole on the azimuth of the marks. 
A great part of that influence has been removed by applying to 
the azimuth, assumed in the reduction, the periodic corrections men- 
tioned in § 5 sub 2°, computed after the formula deduced for the 
14-monthly motion of the pole by Dr. E. F. VAN Dr SANDE BAKHUYZEN. 
In order to obtain the whole influence of this periodic motion, 
this correction of the azimuth has again been added to those 43 
values for each observer. | 
Of these values Zp and Uy for the two observers the mean has 
been taken independently of the number of the observations and 
these numbers are given in Table IIL. 
Ene De bee EET: 
2 Before the correction 
= After the correction of the 
A of the 
S constant of collimation. 
= constant of collimaticn. 
S adel De CAE 
n | "(Up +U y) | (Up Up) | (Up +U y) | U (Up Ur) Obs —Comp. 
1 + 0.017 | + 0.013 +=  OLOLO | + 12 == «0: 003 
2 oe 26 ++ 01 + 19 — 05 fb 10 
3 + 17 + 07 + 17 + 06 + 07 
4 ao LY + Ol + 14 a 08 En 02 
5 00 + 04: + 08 ae 04 ant 10 
6 — 12 =f 10 — 07 + 07 — 21 
7 a 02 zz 02 + 06 00 — 08 
8 + 18 — 03 + 99 a 03 are 07 
9 a 13 = 04. + 16 00 a 01 
10 + 25 4 ll 4 29 oo 06 a 15 
In + 29 == 03 + 32 + Ol + 18 
12 — 05 + 08 + 07 ao 06 — 06 
13 + 16 04. a Ll a 10 — 01 
