406 Capt. Kater’s experiments for determining the variation 
Arbury Hill, 26th October, 1818. Barometer 29,52 inches, thermometer 
47°,5. Chronometer too slow 2^,74.. Pole star on the meridian by the chrono- 
meter io h .37 m .52 s ,02 
Chronometer. 
Level. 
Time from 
the 
meridian. 
N. v. Sines. 
Readings, &c. 
h. m. s. 
10.15. 15 
10.18.40 
10.23. 0 
10.25.43 
10.30.27 
10.34. 5 
10.37.20 
10.39.50 
10.43.15 
10.47. 5 
10.50.52 
10.53.25 
10.57.32 
11. 0.32 
+ 22 
+ 2C 
+ 23 
+ 23 
+ 21 
+ 22 
+ 22 
-f 22 
+ 24 
-f 20 
+ 24 
+ 20 
+ 24 
-f 20 
— 22 
— 24 
21 
21 
— 23 
— 23 
22 
22 
20 
— 24 
20 
— 24 
20 
— 24 
m. s. 
22.37 
19.12 
1 4- 5 2 
12. 9 
7.25 
347 
0.32 
1.58 
5.23 
9- 1 3 
13. 0 
15 - 33 
19.40 
22.40 
4865 
3507 
2103 
1405 
0524 
0136 
0003 
0037 
0276 
0809 
1608 
23 °J 
3680 
4887 
. 0 // // 
1st Vernier - - 143-33-38 
Second - - 33. 3 
Third - - 33.15 
Fourth - - 33.18 
Mean - - 145.33.18,50 
+ 360. 0. 0 
Level - - — 3,60 
Index - - -f- 18,00 
* 4 ) 5 °S- 33 - 32 > 9 ° 
Observed Z. D. - 36. 6.40,92 
Refract. - - + 42,15 
Correct. - - — 11,64 
2 r' C. - — 0,06 
(Z— Z') - -j» 0,28 
+ 307 
— 310 
1867 
— ^l^X2 / ,4= — 3,6 cor. for the level. " 36.7.11,65 
2 ^ 3 Mean P. D. for 1818 + 1.39.44,15 
Const. Log. - - 3.7949876 Precession, &c. 21,30 
Log. 1867 ( + 4) - 7.271 1443 
Co. Lat. 37.46.34,50 
Correct. -i i // ,64 Log. - 1.0661319 
Latitude of Arbury Hill 52.13.25,50 
The mean of the three preceding results is 5^.1^ -25" ,38, 
and the greatest difference T',13. 
In the “ Account of the Trigonometrical Survey/' Col. 
Mudge states, that the zenith sector was put up 34 feet to 
the north, and 28 feet to the west of the old station at 
Arbury Hill; therefore 0,34'' must be added, on this account, 
to obtain 52°.i3 / .23 ,/ ,72, the latitude of the spot where the 
zenith sector was placed. 
