394 Capt. Kate-r/s experiments for determining the variation 
Leith Fort, 17th Sept. 1818. Barometer 30,05 inches, thermometer 66®. Time 
of apparent noon 23 h .54 m .32 s ,8. The Chronometer too fast 8 m .42 5 , 18 (see 
Appendix.) Time by the chronometer at apparent noon o h .3 m .i4 5 ,98. 
Chronometer. 
Level. 
Time from 
Noon. 
N. v. Sines. 
h. m. s. 
23.52.28 
+ H 
— 7 
m. s. 
10.47 
1 107 
23.54.21 
4- ic 
— 10 
8.54 
0754 
0.10. 6 
+ z 5 
— 0 
6.51 
°447 
0. 1 1.26 
4- 10 
— 15 
8.11 
0637 
0.13. 6 
4- 23 
— 0 
9.51 
0923 
0.14. 19 
+ 7 
— i 5 
11. 4 
1 1 66 
Mean . 
4 - 89 
— 47 
839 
Readings, &c. O ’s U. L. 
('4-80 — 4.7) // n r , , 
— — x 2,4z=-|-5o,4Correct.forthelevel. 
Lat. 55.58.41 cosine - 9.7478082 
Dec. 2.24. z cosine - - 9.9996187 
Alt. 36.25.20 cosine co. ar. - 0.0943857 
Log. sin, 1 co. ar. - 5.3 14425 1 
Const. Log. 5.1562377 
Log. 839(4-4) 6.9237620 
Corr. — 120 // ,23 Log. 2.0799997 
1st Vernier 
Second 
Third 
Fourth 
Mean 
Level 
Index 
Observed Z. D. 
Refract. 
Paral. 
Semidiam - 
Correct. - 
Change of Dec. 
(Z-zo 
True Z. D. 
Dec. 
0 / // 
3 I 9-56 45 
30 
30 
»5 
319.56.30 
4 - 5 °> 4 ° 
4- 18,00 
6) 319.57.38,40 
• 53 - I 9 - 36 > 4 ° 
4 - 1. 15» 8 5 
— 7->°3 
4 - I 5 - 57> 2 7 
— 2. 0,22 
— 2.63 
4 - 0,15 
53.34.39,76 
4- 2.24. 1,63 
Deduct, for diff. of 
Stations, (43 ft.) 
}- 
55 - 58-4039 
°>43 
Lat. of the FlagStaff 55.58.40,96 
By the Trigonometrical Survey, the latitude of the Flag 
stafFof Leith Fort, is 55°.5S'.4 ) i // , but from this i",99 must 
be subtracted as before. We have then 55° -5%' -39" >° l for ^ ie 
latitude of the Flag staff, from which that obtained by the 
repeating circle under unfavourable circumstances differs 
i",97 in excess. 
The distance of the clock from the Flag staff was 180 
feet to the north, and the corresponding arc i",8 being added 
