92 
CAPTAIN SABINE ON THE DIFFERENCE IN THE VIBRATIONS 
For the rate of the transit clock the following 1 observations have been selected 
from the Greenwich Observations. 
1828. 
May 15. Castor . . . 
Procyon. . 
Pollux . . . 
Observed At. 
h m s 
7 24 8.57 
7 30 49.34 
7 35 18.54 
Apparent At. 
h m s 
7 23 37.76 
7 30 18.68 
7 34 47.85 
Error of Clock. Means. 
+ 30.81 
30.66 
30.69 
1 at 7 h 29 m 
f +30 s .72 
17. Sirius . . 
Castor . . 
Procyon . 
Pollux . . 
6 38 4.06 6 37 34.41 +29.65 
7 24 7-34 7 23 3774 29.60 (at 7 h 17 m 
7 30 48.06 7 30 18.66 29.40 f +29 s .57 
7 35 17.44 7 34 47-83 29.61 J 
18. Castor... 7 24 6.80 
Procyon . 7 30 47-64 
Pollux. . . 7 35 16.84 
19. Castor... 7 24 6.44 
Procyon . 7 30 47.33 
Pollux. . . 7 35 16.64 
7 23 37.73 +29.074 . 7h 
7 30 18.65 28.99 > <( os 
7 34 47-82 29.02 J 
7 23 3772 +28.72 
7 30 18.64 28.69 
7 34 47.81 28.83 
1 at 7 h 29 m 
j +28 s .75 
18. y 4 19 38 36.68 
a >Aquil0el9 42 55.22 
(3 J 19 47 23.62 
19 38 7-36 
19 42 25.85 
19 46 54.27 
+ 29.32 4 
29.37 > 
29.35 J 
at 1 9 h 43 m 
+ 29 s .35 
19. y 4 19 38 35.96 
a >Aquilsel9 42 54.52 
(3 J 19 47 22.98 
19 38 7-38 +28 58 
19 42 25.88 28 64 
19 46 54.30 28 68 
at 1 9 h 43 m 
+ 28 s .73 
Rate in 
24 hours. 
— 0.58 
— 0.53 
— 0.28 
— 0.62 
In addition to these, we have the following observations of the Sun. 
Observed .At. 
Apparent At. 
Error of Clock. 
Rate in 
h m s 
h m s 
s 
24 hours. 
1828. May 14. 
3 25 22.93 
3 24 51.10 
+ 31.83 
s 
16. 
3 33 15.85 
3 32 45.20 
30.65 
-0.59 
18. 
3 41 11.00 
3 40 41.50 
29.50 
— 0.57 
19. 
3 45 9.76 
3 44 40.40 
29.36 
— 0.14 
20. 
3 49 8.59 
3 48 39.90 
38.69 
—0.67 
Collecting the results in the two preceding tables, we have, 
May. 
1 5 to 1 6 
16tol 7 
17 tol8 
1 8 to 1 9 
19 to 20 
By Castor, Procyon, and Pollux. 
By Sirius, Castor, Procyon, and Pollux. 
By Castor, Procyon, and Pollux. 
By y, a, and /3 Aquilae. 
By the Sun. 
Means 
— 0.58 
— 0.58 
— 0.53 
— 0.28 
— 0.62 
— 0.14 
— 0.67 

—0.59 
— 0.57 
-0.57 
— 0.58 
-0.5 7 
— 0.55 
—0.35 
-0.67 
