in the length of the pendulum vibrating seconds . 393 
The first station was at the Flag staff, the second station 43 
feet to the south of it. 
Leith Fort, 13th September 1818. Barometer 30,25 inches, thermometer 62°. 
Time of apparent noon 23 h .55 m 57 ! ,2. The chronometer too fast 8 m .49 s ,58. (See 
Appendix.) Time by the chronometer at apparent noon o h .4“46*,78. 
Chronometer. 
Level. 
Time from 
Noon. 
N. v. sines. 
h. m. s. 
23 - 55-25 
+ 3 
— 5 
m. s. 
9.22 
o8 35 
23.58.39 
+ 1 
— 7 
6. 8 
0358 
O. I.47 
+ 7 
— 0 
3 - 0 
0086 
O. 4.20 
+ 5 
— 3 
0.27 
0002 
0.14.16 
+ 6 
— 7 
9.29 
0856 
0.16.17 
+ 7 
6 
11.3° 
1259 
Mean 
+ 29 
— 28 
566 
( + 29 — 28) 
2 
X 2,4=— 1,2 correct, for the level. 
Readings, O’sU. L. 
Lat. 55.58.41 cosine 
Dec. 3.56.28 cosine 
Alt. 37.57.47 cosine co. ar. 
Log sin, 1 co. ar. 
Const, log. 
Log. 566 (+4) 
9.7478082 
9 - 99 8 97 i 8 
0.1032402 
5-3H+25I 
5.1644574 
6.7528164 
Cor. — 82"66 Log. 1.9172738 
1 st. Vernier 
Second 
Third 
Fourth 
Mean 
Level 
Index 
Observed Z. D. 
Refract. 
Paral. 
Semidiam. 
Correct. 
Change of Dec. 
(Z — Z') 
True Z. D. 
Dec. 
310.39.15 
38.50 
38.50 
38-55 
3x0.38.57,50 
1,23 
18,00 
6)310.39.14,30 
+ 
+ 
+ 
+ 
51.46.32,38 
1.12,78 
6,88 
15.56,20 
1.22,66 
o. 1,28 
0,16 
52. 2.13,26 
3.56.27,74 
Lat. of the Flag Staff. 55.58.41,00 
8 ? 
MDCCCXIX. 
