355 
As the table shows, the final results for the two observers agree 
mutually within the limits of the errors of observation; this proves 
again that the results obtained by this method must be fairly accurate. 
We may thus use these results for the purpose of subtracting 
from the total values of [A] found for the “bisected night-stars” 
those parts [A], which depend upon the thread-intervals and thus 
obtaining for the tivo positions of the instrument separately the 
portions [4], which are the consequences of the disturbance. The 
results are given in the table below. The results for the threads 1 
to III and V to VII respectively have been combined, but the two 
sub-periods Jan. 1866-—April 1867 and April 1867— July 1868 have 
still been kept separate. 
Values of | A], 
Clamp East Clamp West 
66- 67 67—68 Together 66—67 67—68 Together 
Observer Kam 
Threads I—III — 33 34 34 —65 _',—29 —47 
Ny VV 25 Bon all ET: OP VE 7 
Together —29 34 32 —T70 45 —57 
Observer HENNEKELER. 
Threads I—III —19 5D ery, 20 —I0 | 17 
Rs V= Vibe’ bo, 24a" 52 00 24 =28 
Together —41 86" =238 —28 —17 —22 
The table shows that, contrary to what was originally supposed, 
it is not the times of transit over the second half of the reticule 
only that are abnormal, but that for afl the side threads the distances 
from the middle thread show a deviation of approximately the same 
amount in the same sense, i.e. so that the side-threads appear all 
shifted to the same side. If this be the case, it is undoubtedly 
simplest to suppose, that the observed time of transit over the middle 
thread itself was disturbed. 
This thread would have been observed 
by Kam in 1866—67 = 08050 too early 
in 1867—68 040 ,, 7 
On the average 0045 ,, „ 
by HENNEKELER in 1866—67 0034 ,, _,, 
in 1867—68 EGE. # 
On the average 0030 … gd 
bd LD} K 
; 23 3 
