IN THE OBSERVATORY OF GREENWICH. 
463 
are brought in accordance with it. The corrections and the corrected vibra- 
tions then become 
Corrections for the arcs . 
Corrected vibrations 
I. 
. +2.27 
86077-59 
86079.86 
II. 
+ 0.68 
86079.14 
86079.82 
III. 
+0.19 
86079.66 
86079.85 
On the 29th January the same process was repeated in arcs differing some- 
what from the preceding, and designed therefore to render the differences in 
the results, should they be found to exist, still more conspicuous. 
*32 
o 
E 
CJ 
to 
Times of 
Arcs. 
Mean 
Mean 
Mean 
Reductions 
z' 3 
Z tj 
O 
JZ 
H‘ 
P 
c3 
o 
Disapp. 
Reapp. 
Coincidence. 
Temp. 
Gauge. 
Interval. 
to 36°. 
to a Va- 
cuum. 
per diem. 
1 
17 
o 
34.6 
34.5 
in. 
0.80 
m s 
17 53 
34 26 
m s 
18 01 
34 54 
h m s 
l 17 57 
4 34 40 
o o 
1.39X1.05 = 1.46 
0.76X1.05 = 0.80 
f 34.55 
j + 0.75 
in. 
0.925 
737.69 
— 0.31 
+ 0.42 
86077-11 
1 .uo 
(_ 35.30 
f 34.45 
35 
34.4 
1.23 
17 20 
18 04 
8 17 42 
0.39X1.05 = 0.41 
<) + 0.75 
1.14 
743.44 
— 0.35 
+ 0.54 
86078.98 
l 35.20 
f 34.25 
53 
34.1 
1.36 
0 39 
02 04 
12 01 21.5 
0.17X1.05 = 0.18 
^ + 0.75 
1.295 
745.53 
-0.44 
+ 0.61 
86079-60 
l 35.00 
Examining these observations, we have 
I. 
II. 
III. 
Arcs 
0.80 to 6.41 
6.41 to 6.18 
Vibrations, uncorrected for the ] 
arcs J 
t 76077-11 
76078.98 
76079.60 
Corrections for the arcs by the 
formula j 
+2.03 
+0.58 
+ 0.13 
Numbers which should agree if"] 
the corrections computed by 1 
the formula were a just com- j 
l 76079.14 
| 
76079.56 
76079.73 
pensation J 
MDCCCXXXI. 
3 o 
