This is highly important, as we may now expect, that in the 
other periods which contain but few non-bisected stars the values of 
[lw + [Ode 
9° ‘ 
for the bisected stars will represent the deviation in 
observing the middle thread, and further, that other disturbances 
[Alw— [Ale 
the true thread-intervals. The values of the deviations for the periods 
1, I] and Va are found immediately by taking half of the values 
given before (page 350). As regards the first period we may, however, 
utilize another important series of observations, which has not been 
discussed so far, namely those of stars observed in the day time and 
also observed in declination; observations of that kind occur in fairly 
considerable number during this period (K. E. 79, K. W. 61, H. E. 
82, H. W. 103). They give the following results, where for the sake 
of comparison those according to the night-observations have been 
added. 
are small and that the half-differences + will give us 
Period I. Deviation of the Middle thread. 
Kam. HENNEKELER. 
Thread. Day Night Day Night 
PoE eN, ee Wp) ET B) 
Mito; Vil Sele te Ab EE 
Together sen lek ls Sty eee 
Correetions to the thread-intervals. 
Thread. KAM HENNEKELER (K+H) Night observ. 
I + 37 + 8 + 22 + 28 
I] * + 2 — 21 — 10 + 3 
Il] BAS oa EE EPN: 
V — HH ie — 41 — 34 
VI + 10 + 24 + 17 + 14 
Vil + 16 + 31 + 24 + 30 
It appears from the tables, that the agreement between the results 
from day- and night-observations is in every way satisfactory. Both 
as regards the deviation and the thread-intervals if is closer than 
might have been expected. Where before for Kam the deviation was 
