experiments made with an invariable pendulum. 6 1 
Table VII. ( <znd Series.) 
By the Sun. 
July, 1825. 
Computed vibrations of the 
pendulum in 24 h. the clock 
gaining 69 s . 83 (assumed 
rate) in a mean solar day. 
Observed rate of the 
clock by Suit’s transits. 
Corrections to vibra- 
tions for diff. of rate 
and 69s,88. 
Correct number of vibrations 
made by the pendulum in a 
mean solar day at tempe- 
rature 50°. 
1 No. of Stars observed. 
1 
| Interval in days. 
Factors. 
Prom 
To 
Disappearance. 
Mean of Disap 
and Re-ap. 
Disappearance. 
Mean of Disap. 
and Re-ap. 
s. 
vib. 
6th, P. M. 
8th, A.M. 
86223,406 
86223,555 
70.22 
+ 0,340 
86223,746 
86223,895 
2 
2 
4 
9th — 
86223,/ 36 
86223,585 
70. 16 
+ 0,280 
86223,716 
86223,865 
2 
3 
6 
10th — 
86223,485 
86223,634 
70 20 
4 - 0,320 
86223,805 
86223,954 
2 
4 
8 
8th, P.M. 
9th, A. M. 
86223,5 1 5 
86223,667 
7O.O4 
+ 0,160 
86223,675 
86223,827 
2 
1 
2 
10th — 
86223,561 
86223,725 
70. l8 
+ 0,300 
86223,861 
86224,025 
2 
2 
4 
9th, P. M. 
10th, A.M. 
86223,620 
86223,769 
7°-3 3 
+ 0,450 
86224,070 
86224,219 
2 
1 
2 
Mean. 
86223,812 
86223,964 
Sum of 
Factors 
26 
In this series, the number of vibrations made by the pendulum in 24 hours 
of mean solar time, as obtained from the observations of the disappearance 
of the white disk, and employing the rates furnished by the transits of 
stars, is 86223,803, and by the rates, from the sun’s transits 86223,812. 
By the mean of the observations of the disappearance and re-appearance of 
the disk, the number of vibrations is 86223,938 by the rates, from the 
stars’ transits, and 86223,964 by the transits of the sun. But the sum of 
the factors for the stars being 40, and for the sun 26, the mean number 
of vibrations in 24 hours, by the observation of the disappearance of the 
white disk is 86223,806, and by the mean of its disappearance and re- 
appearance 86223,948. If to each of these, we apply the corrections, 
o y ,33o for elevation, and 6 v ,n6 for the buoyancy of the atmosphere, at 
the mean pressure 29,781 inches, and temperature 5i°,25 of Fahrenheit, 
we shall arrive at the total number of vibrations which would have been 
made by the pendulum in a mean solar day, the temperature being 50° of 
Fahrenheit, in vacuo, at the level of the sea at Port Bowen ; and are 
By the observation of disappearance - 86230,252 
By the mean of disappearance and re-appearance - 86230,394 
By the first series, the total number of vibrations of the pendulum in 
24 hours was 
By the observation of disappearance - - 86230,147 
By the mean of disappearance and re-appearance 86230,288 
