in the length of the pendulum vibrating seconds. 4,4,1 
Leith Fort, 1818 , 17th September, A. M. O’s U. L. 
Chronometer. 
Mean 
True time 
Cbron. fast 
h. m. s. 
7.36.3-1 
7-3S. 26 
7.41.16 
7-43. 1 
7.39.49,2 
7.31. 7,6 
8.41,6 
( + 88 — 72 ) m » 
— 2 - ’ X2,4— + 19,2 
Level. 
+ 24 
+ 22 
+ 20 
+ 22 
+ 88 
— 17 
— 19 
—21 
— 15 
—72 
Readings, 
&e. 
0 ; 11 
First Vernier 
297 - 25.25 
Second 
25.40 
Third 
25.25 
Fourth 
25.15 
Mean 
297.25.20,2 
Level 
+ 19,2 
Index 
+ is 
4) 297.26.3,4 
Observed Z. D. 
74.21.30,85 
Ref. and Parall. 
+ 3.16,6 
Semidiam. 
+ 15.57,3 
True Z. D. 
74.40.44,75 
Leith Fort, 17th September, A. M. ©’s U. L. 
Chronometer. 
Level. 
Readings, &c. 
h. m. s. 
O 1 It 
7-49. 4 
+ 20 
—20 
First Vernier 
- 291.19-55 
7.50.19 
+ 18 
—20 
Second 
19.45 
7-52.19,5 
+ 25 
— 13 
Third 
19.55 
7.54.16,5 
+ 16 
—22 
Fourth 
1955 
Mean - - 7-51.29,8 
+ 79 
—75 
Mean 
- 291.19.52,5 
True time - 7+2.48,2 
Level 
- -f 4,8 
Index 
+ 18 
Cbron. fast - 8.41,6 
4)291-20.15,3 
Observed Z. D. 
72.50. 3,85 
( + 79—75) " " 
Ref. and Parall. 
+ 2.58 
g 11 ■* 
Semidiam. 
- + 15.57,3 
True Z. D. 
73. 8.59,15 
From the above observations the chronometer appears to 
be 8“.4i%6 too fast, and the rate being — V,S^ y we have the 
chronometer 8 m .4,2\i8 too fast at apparent noon. 
