402 Capt. Kater’s experiments for determining the variation 
» 
The difference between the two last results which were 
obtained after the instrument was restored to its original state, 
is not one second, and the mean of the three first differs only 
o",o5, and of the two last results o",o6 from the mean of the 
whole. 
The station where the latitude was observed, was nine feet 
to the north of the chimney of the room in which the clock 
was placed ; and allowing four feet for the distance of the 
clock from the chimney, we have 5 3 0 . 2 f. 43", 12 for the lati- 
tude of the pendulum. 
The distance of Laughton Spire from Clifton Beacon, by 
the Trigonometrical Survey, is 25409 feet, and its bearing 
i°.56'.is / ' to the south-west. With these data, and the angles 
observed on the azimuth circle of my instrument, and given 
in the Appendix, the distance on the meridian, from Clifton 
Beacon to the chimney of the room where the clock was 
placed, was found to be 134b feet, to which nine feet being 
added, and the arc 13", 3b corresponding to this distance sub- 
tracted from the latitude before found, we have 53 0 . 27'. 29", 89 
for the latitude of Clifton Beacon. 
Before I availed myself of the distance of Laughton spire 
from Clifton Beacon, I had measured a base of 797 feet for 
the same purpose, and this gave the distance of the chimney 
from Clifton Beacon on the meridian 1323 feet ; but as I could 
not see the same part of the chimney from both ends of the 
base, this determination serves merely to check that before 
given, and to render it highly probable that there cannot be 
an error of 10 feet, and perhaps not near so much in the 
distance first stated. 
The observed arc between Greenwich and Clifton Beacon, 
