43 § An Account of the Measurement 
There is, therefore, a difference of only half a foot, between the 
two results. We may, consequently, take 1036334 feet, for the 
distance required. 
I have observed, in a former part of this account, that the 
zenith sector was placed 6 ± feet from the station at Dunnose, 
and 3-I feet from that at Clifton, the new points being due 
south of the old. We must therefore add 3 feet to 1036334; 
which gives 1036337 feet, for the total length of the arc of the 
meridian. 
The sum of the parallels to the meridian of Clifton, reaching 
down to Arbury Hill, is 450047,5 feet; and the distance of the 
latter from that meridian 1996 feet. This is, in fact, the meri- 
dional extent between the two old stations, as no correction is 
re uisite. We must, however, subtract 30 feet from this distance, 
as the sector was put up 34^- feet northward of the station on 
Arbury Hill. Therefore, 450047,5 — 30 = 4500 17,5 feet, is the 
length of the arc comprized between the parallels of the new 
stations at Clifton and Arbury Hill : and, subtracting this from 
1036337, we have 586319,5 feet, for the distance of this latter 
station from the point over which the sector was placed at 
Dunnose. 
Although the zenith sector was taken to the R :yal Obser- 
vatory at Greenwich, rather with a view of collecting materials 
for finding the latitude of Dunnose, than to answer any other 
purpose, yet, as I am provided with the means of finding the 
meridional distance between those places, and that with suffi- 
cient accuracy, I shall go through the work in this place. 
