4^3 
An Account of the Measurement 
Observed Zenith Distance of i a Cygni. 
Point on the Limb, 2° 20' North. 
Day of 
Face of 
Plumb- 
Observa- 
Zenith distance 
Zenith distance 
I 
Baiomc- 
! Th rmometer. 
the 
the arch, 
line. 
tion of 
in revolutions 
reduced. 
ter 
month. 
W. or £. 
the star. 
and parts. 
Above 
lit low. 
rev div. 
rev. div 
0 ' rev. div. 
0 ' • 
Inches. 
0 
0 
June 13 
E 
9 26,60 
12 33-5 
2 20 3 6,90 
2 23 4,20 
28.8 
50,0 
50,5 
14 
W 
5 54 > 9 8 
2 37,0 
17.98 
I),3° 
28.9 
52,1 
SO,o 
16 
E 
8 49.45 
6 52,9 
* 55*55 
5,26 
28,8 
59 9 
59 -o* 
*8 
W 
10 12,05 
6 58,8 
2 20 3 16,25 
*3 57 
28,8 
$0,1 
SO,o 
zb 
E 
9 9- 8 3 
12 20,0 
10,17 
7 > 4 8 
29,0 
54-9 
56,1® 
*1 
W 
11 1,83 
7 44 2 
16,63 
* 3-95 
29,0 
55 »° 
5 3*5 
• Point on the limb z° 25'. 
Observed Zenith Distance of 1 o i Cygni. J 
Point on the Limb, o° 40' North. 
Ju-e 13 
E 
9 3°-95 
10 55,2 
0 40 1 24 25 
0 41 23,39 
28,8 
50,0 
14 
W 
0 50,05 
4 51,8 
32,25 
31,40 
28,9 
5 i -7 
16 
E 
8 43 00 
10 9,5 
25-50 
24» & 4 
28,8 
60,0 
18 
W 
9 3 8 > 9 ° 
8 26 0 
32,90 
32,05 
28,8 
50,2 
20 
E 
8 30,78 
10 0,0 
28,22 
27,36 
29,1 
55 -o 
*1 
W 
li 19,80 
9 45 * ' 
33*70 
32,85 
28,9 
55 »o 
Observed Zenith Distance of y Ursce . 
Point on the Limb, 4 0 10' North. 
50,5 
50,5 
59.0 
50.0 
56.0 
55 >S 
May 9 
E 
n 42,53 
12 14 6 
4 10 0 31,07 
4 10 31,12 

_ 
ic 
E 
1 1 10,60 
u 42,5 
31.90 
3 i *95 
29,0 
52,0 
52,0 
1 1 
W 
8 34,32 
7 54 4 
3 8 -92 
38-98 
28,8 
50,5 
5 i-S 
*3 
E 
9 54-86 
10 29,5 
33*64 
33.69 
28,8 
45-7 
44-3 
*4 
E 
10 1,47 
10 34-5 
33-°3 
33 ,o 8 
28 9 
38,5 
38-5 
*5 
W 
7 15 49 
6 33,6 
40,89 
40,96 
28,9 
41,0 
4 i*S 
J 7 
E 
8 54 00 
9 29 5 
34 - 5 ° 
34,56 
28.8 
46,0 
42, s 
20 
E 
13 43-03 
14 18,1 
34-07 
34 ,i 3 
28,7 
50,5 
51,0 
June 5 
W 
9 21,10 
8 35-5 
43,60 
43.67 
28,4 
53 -o 
55 ,* 
8 
E 
8 58,90 
9 36,2 
37 - 3 ° 
37.36 
28,5 
55-5 
58,5 
12 
E 
5 46,50 
6 22,4 
34 - 9 ° 
34-96 
28,6 
54 -o 
54 >°t 
13 
W 
10 40,70 
9 564 
43 - 3 ° 
43-37 
28,7 
59 -i 
59,0 
14 
W 
7 16,40 
6 53,0 
42,40 
42-47 
28,9 
60,4 
59-3 
16 
E 
5 3-2o 
9 41-1 
38,00 
38,06 
28,8 
72,0 
69,5 
f Imperfect observations 
J In page 417, to v Cygni should be 10 «, £ Ursse should be 85 v Herculis should 
be 85 k an u v Herculis should be v. 
