in the length of the pendulum vibrating seconds. 379 
knife edge of the pendulum had suffered no injury from use, 
but that my allowance for expansion . was correct, a circum- 
stance of the greatest importance to the truth of my results, 
and respecting which there might have been most reason to 
apprehend error. 
Operations at the Isle of Wight. 
On the 8th May 1819, I again left London for the Isle of 
Wight. D unnose, the most southern station of the meridional 
arc of the Trigonometrical Survey, is marked by an iron gun, 
sunk in the ground on the summit of a hill near the village of 
Shanklin, a little to the north of a signal post.* The nearest 
house to this station is Shanklin Farm, in the occupation of Mr. 
Jolliffe, from whom and from the proprietor, the Rev. Mr. 
White, I most readily received permission to make use of a 
summer house, well suited to the purpose, for my experiments. 
The observations made at this station are detailed in the 
Appendix. The weather was very favourable after the 12th; 
and though before that period I was not able to obtain the 
transit of more than one star and of the sun, these obser- 
vations were satisfactory. The results are contained in the 
following Tables. 
Transits observed at Shanklin Farm. 
Stars. 
May 10 . 
May It. 
May 12. 
May 13. 
May 14. 
May 15. 
May 16. 
h. m. s. 
h. m. s. 
h. m. s. 
h. m. s. 
h. m.'s. 
h. m. s. 
h. m. s. 
The Sun 
— 
0.0.49,49 
— 
0.0.26,89 
0.0.16,44 
0. 0. 6,51 
11.59.57,71 
Regulus 
6.52 37,32 
— 
— 
6.40.21,123 
— 
6.32.10,35 
6.28. 5,65 
X . 
— 
— 
9. 1 1.2 1,26 
— 
— 
— 
8.55. 0,74 
e Virginis 
— 
— 
Q. 38. 24,l6 
— 
— ■ 
— 
9.22. 2,83 
a . Virginis 
— 
' • 
IO. 0.49,30 
— 
— x 
— 
9.44.28,08 
t Bootae 
— 
— 
10.23.46,20 
— 
— 
— 
10, 7.25,28 
» Boots 
— 
— 
IO.3I. 9,37 
— 
— 
— 
10.14.38,58 
Arcturus 
1 " 
10.52.26,25 
— 
— 
— "* 
10.36. 5,44 
* The height on which the station is situated, is properly called Shanklin Down ; 
Dunnose is the next projecting point to the southward. 
