218 
Observations to determine the amount of 
Table V. 
Observations for determining the Apparent Altitude of « Aquilse at setting, by Captain Parry’s 
lower telescope. 
The corresponding observations for Refractions are contained in Table VI. 
Day. 
Time. 
No. of 
Obser- 
vations. 
Mean Reading of 
the 4 Verniers. 
Correction for 
Apparent 
Altitude. 
Barom. 
Corr. to 
Temp. 
+ 50°. 
Tem. 
Fah 1 . 
Winds 
True. 
Weather. 
Remarks. 
Index. 
Level. 
1825. 
Feb. 16th 
1 8th 
22d 
h. h. 
1 to 2 P. M. 
2 to 3 P. M. 
8 to 9 A.M. 
z\ to 4 P.M. 
8 to 9 A.M. 
IV 
Difference of tl 
8 
8 
8 
8 
8 
lean al 
Dit 
le two 
322 48 33,75 
285 37 12,5 
322 48 00 
28; 35 12,5 
322 48 12,5 
titude by repe 
to for upp 
telescopes by 
// 
“f“ I O 
* 
+ 2,5 
* 
+ IO 
iting c 
er tele 
zenith 
/, 
— 10,25 
— 16,25 
+ 29,25 
+ *'24,25 
— 12,25 
ircle .... 
scope. . . . 
distances 
0 / /, 
4 38 55 . 8 i 
57.*9 
56,03 
55 + 1 
58,72 
4 38 56.63 
4 32 3 Z >34 
6' 2 4", 2 9 
Inches. 
29,831 
29,831 
29,608 
29,645 
29,791 
SeeTaf 
0 
-36 
- 34 l 
-29 
-26J 
-30 
). III. 
Easterly 
Easterly 
Easterly 
Easterly 
ESE 
Fine 
Clear 
Ditto 
Ditto 
© had been on the board 
just before the observation. 
O not up. 
O had set. 
0 not on the board. 
Observations by the micrometer, to obtain the angular distance between the two telescopes used 
for observing the setting of «, Aquilae. The telescope placed on the board as before described. 
March 12th, 1825. 
From io h 30™ to 1 i b 30™ A. M. 
From Noon till i h o m P. M. 
Upper wire] 
lixed. 
61.2 
58.8 
59 > 2 
60.2 
60.9 
62.3 
60 
62 
61 
63 
60,86 
49 > 2 5 
Lower wire 
moved. 
45.8 
50,6 
53 
46,3 
48.8 
S 1 
49 
49>4 
49*3 
49' 3 
49 ' 2 5 
Upper wire 
fixed. 
32 
32.5 
3 i'S 
33'2 
32,3 
33*8 
32.8 
36.8 
3<5,z 
37 
33 . 8 i 
ii,6i +8 turns of the screw = 81 1,61 divisions. 
- 811,02 ~ -f 8 turns 
Lower wire 
moved. 
43 
44 
43 ' 2 
43.8 
48 
43 
43.8 
45 
47 
47'5 
44'83 
33 . 8 i 
1 1,02 
Mean 811,31 * 47' 7" (the value of each 
— division) zz 6' zy'^og. 
Difference of altitude between the two telescopes by the repeating circle 6' 24",29 
by the micrometer 6 27 ,09 
Altitude observed for the upper telescope (Table III.) . . . . . . . . . 
Altitude for lower telescope, used for the refractions, in Table VI, 
. . .6 25 ,69 
4 3 z 32 ,34 
4 38 58 ,03 
