PENDULUM AT THE ROYAL OBSERVATORY, CAPE OF GOOD HOPE. 157 
The height of barometer assumed as standard for spec. grav. = 29.27 inches. 
The height of the pendulum above the mean level of the sea in Table Bay 
was found to be 32 feet nearly, and above the low-water mark 34 feet, on the 
day when it was determined. Hence 
Vibrations. 
For 34 feet at the Cape . . 
. . Reduction = 0.14 
For 83 feet in London . . 
. . Reduction = 0.34 
Difference = 0.20 
This quantity 0.20 vibration is additive to the difference between the num- 
ber of vibrations (in a mean solar day) at Mr. Browne’s and the Cape. 
Brief statement of the final results. 
1st, — Captain Ronald. 
Observations made in London. — Pendulum (No. 4. Jones). 
Vibrations in a Mean Solar Day. 
Mean of 100 coincidences . . . =86164.62 
Observations made at the Cape of Good Hope. 
Vibrations in a Mean Solar Day. 
Mean of 270 coincidences = 86097-64 
Mean of 160 = 86097.88 
Mean of 200 = 8609774 
True Mean of 630 = 86097-73 
2nd, — Mr. Johnson. 
Vibrations in a Mean Solar Day. 
Mean of 240 coincidences = 86097792 
Mean of 180 = 86097-898 
True Mean of 420 — — = 86097-83 
