21 6 
Observations to determine the amount of 
Table III. 
Observations for determining the apparent altitude of a Aquilse at setting, by Captain Parry’s upper 
telescope. The corresponding observations for refraction are contained in Table IV. 
No. of 
Obser- 
vations. 
Mean Reading of 
the four Verniers. 
Correction for 
Apparent 
Altitude. 
Barom. j 
Corr. to ] 
Temp. 
+ 50',. 
Temp. 
in 
Shade 
Fah 1 . 
Index. 
Level. 
O t 
/! 
// 
// 
0 ' 11 
Inches. 
0 
8 
3 2 3 4 ° 
12,5 
+ IO 
— 2,25 
4 32 27,47 
30,04 
—39,5 
8 
3 2 3 41 
IO 
+ IO 
— 34,5 
24,31 
—40,5 
8 
323 4 1 
07.5 
4 -IO 
—40,5 
25,37 
29,05 
— 26 
8 
323 4 ° 
15 
+ 7,5 
-1-21,5 
24,53 
30,15 
-31,5 
8 
323 4 ° 
30 
+ 11,25 
— 8 
25,84 
29,65 
—31,5 
8 
323 37 
53.25 
+ 7,5 
+ 40,5 
39,84 
29,90 
—18 
8 
287 18 
J 7.5 
* 
-i'o8,25 
35.5 
— 
—19 
8 
2 5 ° 56 35.75 
* 
4 - 2+75 
39,62 
— 
—19 
8 
214 36 37,5 
*fa 
— 8 
30,78 
.... 
—18,5 
8 
178 16 
32,5 
* 
— 11,75 
32,04 
29,93 
-19 
Me; 
in of observatioi 
is at low 
ar station 
4 32 30,53 
rations 
were made at the upper 
station. 
20 
90 54 
40 
+ IO 
+ 1 0,25 
4 32 45 ,oi 
30,19 
—35 
. 20 
90 51 
57.5 
0 
- 1 ' 47,7 5 
30,49 
29,98 
—27 
20 
1 81 46 
12,5 
* 
1'26,25 
38,44 
.... 
—27 
20 
272 36 
4^75 
'fa 
—50,75 
29,27 
30,00 
—28,5 
10 
225 24 
34.25 
+ !0 
+27,25 
3 I » I 3 
30,26 
— 28 
10 
90 50 
13.75 
* 
+ l'20 
41,95 
.... 
—29 
10 
316 14 
29,25 
'fa 
+ i'i6,25 
3 3, 1 7 
30,28 
—29 
10 
181 40 
W ,5 
* 
—32 
31,62 
.... 
—30 
6 
28 54 
32,5 
* 
+ 29 
27,33 
30,30 
—30,5 
10 
225 23 
17.5 
-J- 6,2 
+ 18,25 
22,19 
30,37 
—37 
8 
261 43 
03.75 
* 
+ 9 
29,41 
30,38 
—35 
IO 
225 23 
42,5 
+ 10 
+ 3 i 
26,35 
.... 
-34 
IO 
167 39 
58,75 
* 
+ 22,25 
31,35 
30,39 
—29 
IO 
293 05 
J 5 
'fa 
+ 26,25 
34,25 
30,34 
—28 
8 
36 20 
58,75 
+ 1 2,5 
—30,25 
35, J 3 
.... 
—29 
10 
f 64 26 
32,5 
Ifa 
— 35,25 
26,22 
30,35 
—33 
IO 
225 24 
38,75 
+ 7.5 
— 25,75 
26,05 
30,20 
— 35,5 
IO 
225 25 
30 
+ 6.5 
+ 28,25 
36,47 
30,12 
—27 
IO 
ff6 7 44 
05 
+ 59,5 
39 , 2 o 
30,05 
—27,5 
IO 
tJ 95 5 i 
! 7’5 
'fa 
—55 
33,75 
30,02 
— 3 i 
8 
36 19 
5 ° 
-f- 6>2 
— 7 i ,5 
20,59 
29,79 
—35 
IO 
202 1 9 
05.5 
>fa zfa 
+ 7 
37,80 
75 
—26,5 
12 
54 29 
5 I , Z 5 
+ 7,5 
— 45,5 
26+0 
76 
—30 
. 8 
36 21 
* 7,5 
+ 10 
— 58,75 
33,59 
29,90 
—33 
8 
72 42 
12,5 
•fa 
— 3> 2 5 
36,47 
.... 
—35 
2 sets t 
aken at night at the uppe 
r station 
4 32 35,03 
Day. 
1825. 
Feb. 2d 
28 th< 
Time. 
$ io 30 A. M. 
| to 2 P. M. 
1 1 to Noon, 
i to 2 P. M. 
Noon to 1 P. M. 
10 30 to 1 1 30 A. M, 
o to o 40 P. M. 
0 45 to 1 30 P. M. 
1 25 to 2 15 P. M. 
about sunset. 
Mar 7 th 
8 th 
ioth^ 
1 ith. 
1 2th < 
i4th< 
f 10 30 A. M. 
I to o 40 P. M. 5 
10 A. M. to Noon, 
to 2 P. M. 
to 4 30 P. M. 
c. t( 
{• 
0 46 to 1 50 P. M. 
2 to 2 55 P. M. 
3 10 to 4 15 P. M. 
4 15 to 5 40 P. M. 
6 30 to 7 40 A. M. 
7 50 to 8 40 A. M. 
9 45 to 10 40 A.M. 
Noon to 1 P. M. 
1 25 to 2 30 P. M. 
3 10 to 4 P. M. 
4 50 to 5 30 P. M. 
6 30 to 7 30 A. M. 
11 45 to o 35 P. M. 
2 50 to 3 30 P. M. 
4 10 to 4 50 P. M. 
6 15 to 7 15 A. M. 
1 30 to 2 30 P. M. 
4 20 to 5 40 P. M. 
22d o till 1 A. M. 
Winds 
True. 
Easterly } 
very light } 
NNE Fresh 
Easterly Light 
NortherlyLight 
f 
j Easter- 
-< ly very 
I light 
L 
Varia. & Light 
Easterly Light 
Nearly 
calm wea- 
ther 
Ditto 
Ditto 
Fine and 
nearly 
calm 
through- 
out the 
day 
Ditto 
Ditto 
Calm 
Weather. 
Very clear 
Hazy 
Clear & fine 
Hazy 
Clear and 
warm 
Remarks, 
The sun did not 
rise upon the 
board till the 
1 2 th, nor on the 
place of obser- 
vation till the 
14th. 
Clear Sun bright and 
Cloudy vei 7 warm 
©breaking through the clouds 
© obscured 
Very clear 
Ditto 
Clear 
Ditto 
Ditto 
Ditto 
Ditto 
Very clear 
Western land 
much refracted. 
© rose towards 
the conclusion. 
* Index not reset to 360° after the last observation. 
X Index not reset after an observation for another object, 
f Ditto ------ 
ft Ditto ------ 
X X Ditto ------ 
** Ditto ------ 
Index error 202° 15' 07", 5. 
199 01 35. 
202 18 32,5. 
230 24 45. 
336 52 54.5- 
Mean of 80 zenith distances taken at the lower station 
Mean of 278 at the upper station 
Mean of both stations by day 
Mean of 16 zenith distances taken at night 
Mean of all the above /- 
Altitude. 
/ n 
3 2 3°,35 
3 2 3 2 A3 
3 2 Si.67 
3 2 35.°3 
432 32,34 used in computing the refractions in Table IV. 
