436 -dn Account of the Measurement 
between Clifton and the perpendicular to the meridian of 
Dunnose ; which may be taken for the true length of the arc 
itself, as the distance of the former station from the meridian 
of the latter, is only 4,770 feet. 
If the angle between the meridian and the staff at Brading Down 
was observed accurately, there can be no doubt of the correct- 
ness of this determination ; but, as it was right on my part to 
adopt measures for bringing it to some proper test, I observed, 
as before stated, the direction of the meridian at Clifton. The 
particulars were as follows. 
Observed Angles between the Pole Star, when at its greatest 
Elongations from the Meridian of Clifton, and the Staff erected 
over the Station at Gringley on the Hill. 
August, 1801. 
Days. 
Evenings. 
Mornings. 
9th. 
- 
1 oo° 
45 ' 
46" 
10th. 
- 
IOO 
45 
43 >5 
11th. 
- 
100 
45 
45>5 
10 6° 
39 ' 
34 " 
13th. 
- 
100 
45 
39 
10 6 
39 
22 
16th. 
- 
100 
45 
4°>5 
17th. 
- 
100 
45 
4 1 
10 6 
39 
24 
18th. 
- 
100 
45 
39 
106 
39 
28 
19th. 
- 
100 
45 
4^5 
106 
39 
27. 
If a mean of 
all 
the evening observations be taken, 
get ioo° 45' 42", 8, for the angle between the staff at Gringley 
and the star when at its greatest eastern elongation from the 
merdian. In like manner, if a mean of all the morning observa- 
tions be taken, we shall have 106° 39' 27'', for the angle between 
the same staff and the star on the western side. Hence, half their 
