44° Capt. Kater’s experiments for determining the variation 
Portsoy, 1818, 3rd August, P. M. Q’s U. L. 
Chronometer. 
Level. 
Readings, &c. 
h. m. s. 
O I ti 
First Vernier - 234.26.55 
4. 8.35 
+ 4 
— 2 
4. 9-50,5 
— 1 
— 6 
Second - 45 
4.11. 7 
+ 2 
— 4 
Third - - 40 
4.12. 4,5 
+ 5 
— 0 
Fourth - - 60 
Mean - . - 4.10.24,2 
+ 10 
— 12 
Mean - - 234.26.50 
True time - 4. 2.31,3 
Level - - — 2,4 
Index - - + 18,0 
Chron. fast - - 7.52,9 
4)234.27. 5,6 
do — ig') * 
Observed Z. D. - 58. 36. 46, 4 
J__J X 2,4=— 2,4 
Ref. and Parall. - + 1-24,7 
Semidiam. - + 15.47 
True Z. D. - 58.53.58,1 
Portsoy, 3rd August, P. M. O's U. L. 
Chronometer. 
Level. 
Readings, &c. 
h. m. s. 
4.15.56.5 
4.17. 9 
4.18.29.5 
4.20. 5,5 
+ 4 
+ 4 
+ 5 
+ 1 
+ 2 
+ 1 
+ 3 
— 2 
o / n 
First Vernier - 238.18.40 
Second 25 
Third 30 
Fourth 50 
Mean - - 4.17-55,1 
True time - - 4.10. 3,4 
Chron. fast - - 7-51,7 
( + 14 + 4) >> t " - 
~— a ~ — - X 2,4=2 1,6 
I 2 
+ 14 
+ 4 
Mean - - 238.18.36,6 
Level - + 21,6 
Index - - + 1 8,0 
4) 238.19.16,2 
Observed Z. D. - 59-34.49,0 
Ref. and Parall. - + 1.30,4 
Semidiam - + 15.47 
True Z. D. - 59-52. 6,4 
Sun rather obscure during some of 
these observations. 
From the mean of the above observations, the chronometer 
appears to be 7“. 52", 3 too fast, and the rate being — i',7 we 
have the chronometer 7“ .52* ,58 too fast at apparent noon* 
