390 Capt. Kater’s experiments for determining the variation 
Portsoy, 3d Aug. 1818. Barometer 30 inches, thermometer 65°. Time of 
apparent noon o\ 5”. 5 i\ The chronometer too fast 7 m .$2\ 58. (See Appendix.) 
Time by the Chronometer at apparent noon o h .i3 m 43',58. 
Chronometer. 
Level. 
Time from 
Noon. 
N. v. Sines. 
Readings, &c. O *s U. L. 
h. m. s. 
m. s. 
0. 5.23 
+ 3 
4 6 
8.21 
0664 
° / II 
0. 7.16 
+ 4 
+ 5 
6.28 
0398 
1st Vernier - 117.35.15,00 
0. 9. 8 
+ S 
+ 7 
4.36 
0201 
Second - - 34.35,00 
0.10. 7 
+ 2 
+ 3 
3-37 
OI24 
Third - - 34.20,00 
0 12.17 
0.13.36 
+ 4 
— 5 
+ 7 
— 3 
1.27 
0. 8 
0020 
OOOO 
Fourth - - 34 * 35 >°° 
0iI 5-43 
— 10 
— 6 
1.59 
0037 
Mean - - 117.34.41,25 
0.17.38 
— 6 
— 4 
3-54 
01 45 
-f 360. 0. 0,00 
0.20.36 
+ 7 
+ 9 
6.52 
0449 
Level - 4 0. 0. 6,00 
0.22.30 
0.24.58 
— 9 
+ 1 
— 7 
+ 3 
8.46 
11.14 
0732 
1201 
Index - - 4 °* 0.18,00 
0.26 42 
~ 7 
— 4 
12.58 
1600 
12) 477 - 35 * 5> 2 5 
Mean 
— 11 
4 16 
464 
Observed Z. D. - 39-47-55>44 
Refract. - + 0.46,43 
(—II4I6) // // , . £ , | | 
- ■ x 2,4“ 4 6 correction for the level. 
Lat. 57.40.57 cosine 
Dec. 17-37.50 cosine - 
Alt. 49.56.53 cos. co. ar. 
Log. sin. 1 co. ar. - 
9.7280375 
- 9.9791062 
- ° i9H 6 3 7 
- 5.3144251 
Paral. 
Semidiam. 
Correct 
Change of Dec. 
(Z-ZO 
+ 
+ 
, 5 - 47«77 
1.15,78 
o. 1,15 
0,26 
True Z. D. 40. 3. 7,36 
Dec. + i 7 - 37 - 5°*°3 
Const. Log. 
Log. 464(44) 
5.2130325 
6.6665180 
Lat. of Portsoy. 57.40.57,39 
Cor.— 7S",78 Log. 1.8795505 
The distance from the place where the latitude was deter- 
mined to the pendulum, measured on the meridian, was 129 
feet, which is equal to i",2 6. 
This being added to the observed latitude we obtain 
57°.4,o'. 58", 65 for the latitude of the pendulum. 
In order to deduce my latitude from that of Cowhythe, a 
station was chosen on a small eminence called Portsoy Hill, 
l 
