354 
however, carried out by Kam alone and the Göttingen-stars were 
only observed in the position clamp West. For this reason it was 
ultimately considered advisable not to use the last-mentioned set. 
We begin by giving the values of the half sums 4 (Aly +[4],): 
it will appear immediately, why we now divide by two. 
(Al + [4],)- Non-bisected stars. 
Observer KAM Observer HENNEKELER 
Thread — TT —— - EN GRS 
1866 - 67 | 1867—68 L. Brussels Mean | 1865 —61  1867-—68 Mean 
| 
] —14 —22 + 6 —10 +-10 —10 0 
I} 2 ae —24 10 Ee te) ais 
a Ne a a 43 90 —10 48 4-29 +15 
V |. -—20 | .—15 —28 —21 0 +12 + 6 
VI — 9 —14 —18 —14 +4 --22 —9 
MIL Sie 24) — 33 pe ie 1011 
Mean | — 9 —14 —20 -—14 +4 — 2 + 1 
It appears, that with HeNNEKELER the observation of all the threads 
was accomplished without any abnormality; with Kam an anomaly 
seems to show itself, particularly in the later observations, in the 
same sense as for the bisected stars, but of a much smaller amount. 
It is therefore very probabie, that in this ease the combination of 
the two positions of the instrument will yield practically correct 
thread-intervals. By taking the mean of the results Cl. W. and Cl. E., 
ie. by forming the half-differences + } ([Aly —[A)],), the following 
results are obtained: 
Corrections to the preliminary thread-intervals VI according to the non-bisected stars. 
= Observer Kam Observer HENNEKELER 
5 tl ER 
2 | Bee 
FE 1866—67 | 1867—68 L. Brussels Mean 1866 671867—68 Mean 
I see 8 rr | EG | Pe eee 
High EE EN hat ie 213.) A6) 2 | =36, eee 
Ta 10 a —50 | —31 | —24 | —20 | —22 | —26 
Vv Si +26 +19 SE tah EO "| SIZE 
VI ED ian Ne. En MENEER lesen 7 
VII 0 8290). vloe 0 EE RE SE NT 
