in the length of the pendulum vibrating seconds. 397 
contrivance executed at Edinburgh, by which I could fix the 
level very firmly in its horizontal position to the pillar of the 
instrument. This being done, the following observations 
were made for the zenith distance of the pole star. The cor- 
rections for precession, & c are those used at the Royal 
Observatory at Greenwich, and the mean polar distance of 
the pole star is that resulting from the latest observations of 
the Astronomer Royal. 
The transit instrument was within one second in time of 
the meridian, the error of the chronometer was therefore 
deduced from the passage of the sun. 
Clifton, 3d October, 1818. Barometer 29,20 inches, thermometer 44 0 , chrono- 
meter too fast 5’, 15. Pole star on the meridian by the chronometer I2 h .8 m .48 s ,5. 
Chronometer. 
Level 
Time from 
the 
meridian. 
N. v. Sines. 
Readings 
, &c. 
h. m. s. 
m. s. 
0 / // 
11.54.24 
+ 
20 
— 16 
14.25 
1978 
1 st Vernier 
348.44. 0 
11.58. 9 
+ 
7 
— 3 ° 
10.40 
1083 
Second 
43.50 
12. 1.17 
4 
9 
— 3 1 
7 32 
0540 
Third 
4 . 3-37 
12. 6.12 
4 
20 
— 20 
2-37 
0065 
Fourth - 
- 43-25 
12.10.16 
+ 
18 
— 20 
1.27 
0020 
12.14.15 
4 
1 1 
— 26 
5.26 
0281 
Mean 
- 34 8 - 43-43 
12. 16.55 
4 - 
16 
— 23 
8. 6 
0624 
Level 
— 1.41,6 
12.20. 0 
+ 
7 
— 30 
1 1. 1 1 
II90 
Index 
4- 0.18,0 
1 2.24.1 2 
+ 
19 
— 20 
* 5-23 
2252 
1 2.27.10 
4 
4 
— 33 
18.2 1 
3204 
jo) 348.42.19,5 
Mean - 
4-131 
—249 
II24 
Observed Z. D. 
- . 34 - 5 2 - 1 3>94 
1 
Refract. 
4- 40,14 
4-131 — 249 // / // - , , 
— X 2,4= — 1. 41, 6 correct, for level. 
O / " 
Lat. 53.27.41 cosine 
Dec. 88.20.28 cosine - 
Alt. 55. 7.13 cosine co. ar. 
Log, sin. 1 co. ar. 
- 9 - 7747 8 2 § 
- 8.4616340 
- 0.2427136 
5.3168000 
Const. Log. 3.7959304 
Log. 1124(4-4) 7.0507663 
2 r'C. 
(Z-zo 
True Z. D. 
Mean PD. for 1818 
Precession, &c. - ■ 
Co. Lat. 
Lat. of Clifton 
+ 
7>°3 
0,04 
0,30 
34.52.47,31 
4 1 • 39 - 44’ 1 5 
— 1 2,40 
36.32.19,06 
Correct. — Y',oz 6 Log. 0.8466967 
53.27.40,94 
