445 
of an Arc of the Meridian . 
sector turned half round. It was then again introduced into its 
supports, and the interior stand moved, till the wires in the 
focus of the lateral telescope appeared on the obelisk as before. 
The vernier was then examined, which again stood at 84° 5'. 
This being settled, the sector was turned round, till its vernier 
stood at 176° 22' on the azimuth circle, in which situation, the 
plane of the divided arc was necessarily parallel to that of the 
meridian. The task of observation then commenced, and the 
performance of it was as follows. 
Observations made at Dunnose , to determine the Zenith Distance of 
(3 Draconis . 
Point on the Limb , i° 50' North . 
Day of 
the 
month. 
Face of 
the arch, 
W.orE. 
Plumb- 
line. 
Observa- 
tion of 
the star. 
Zenith distance 
in revolutions 
and parts. 
Zenith distance 
reduced. 
Barome- 
ter. 
Therm 
Above. 
ometer. 
Below. 
1802 
rev. div. 
rev. div. 
0 ' rev. dir. 
0 » 9 
Inches. 
© 
O 
May 1 1 
W 
9 4 * 8z 
9 > 7*9 
1 50 0 13,08 
I 49 46,90 
28,85 
43*5 
43*5 
*3 
E 
9 16,95 
8 56,0 
19,95 
40,02 
28,85 
36,5 
38,0 
H 
w 
9 34*25 
9 47*5 
13» 2 5 
46*73 
28,92 
34*5 
34*5 
16 
E 
8 32,16 
8 14,0 
18,16 
41,81 
28,82 
35*5 
34*5 
June 5 
w 
6 23,00 
6 30,0 
7,00 
52,99 
28*45 
5 i *5 
5 i *5 
8 
E 
8 14,02 
8 2,0 
12,02 
47,96 
28,49 
52,0 
51,8 
11 
W 
6 57,40 
7 2,6 
4,20 
55 * 79 , 
28,54 
52,5 
52,0 
13 
£ 
9 39 > 5 ° 
9 2 9>5 
10,00 
49,98; 
28,79 
53 ,o 
52,7 
»4 
w 
8 19,29 
8 23,7 
4*41 
55*58 
28,86 
54*2 
53 *o 
16 
E 
3 56.61 
3 47*0 
9,61 
5°»37 
28,75 
59*5 
60,0 
*7 
w 
8 38.52 
8 41,5 
2,98 
57,02 
28,82 
56,1 
58,0 
18 
E 
11 31,87 
11 21,5 
*0.37 
49,61 
28,81 
5 . 2 ,° 
51*0 
20 
W 
8 53.^7 
8 54,2 
o *93 
59*°7 
29,03 
57.5 
58,0 
21 
E 
10 27,05 
io 19,7 
7*35 
52*64 
28,99 
56*5 
55*5 
MDCCCIII. 3M 
